A vibration damping rotor assembly and a motor

Abstract

The present invention discloses a vibration damping rotor assembly and a motor. The vibration damping rotor assembly includes a rotor core, a permanent magnet, a rotating shaft, and a first 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, and the rotating shaft is arranged in the rotating shaft hole. The first end and the second end of the rotating shaft extend out of the rotating shaft hole. There is a gap between the rotating shaft and the rotor core. The first end vibration damping member is arranged on the first end face of the rotor core and is connected to the rotor core. In the axial direction of the rotor core, the first end of the permanent magnet extends out of the magnet slot and is fitted in the first end vibration damping member, or the first end of the permanent magnet retracts into the magnet slot so that a part of the first end vibration damping member is fitted in the magnet slot. The first end vibration damping member is directly fitted with the rotating shaft or is fitted with the rotating shaft through a first transmission member arranged in the first end vibration damping member. The vibration damping rotor assembly of the present invention can increase the material amount of the vibration damping member, has good vibration damping performance, and low vibration noise.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly, to a vibration damping rotor assembly and a motor having the vibration damping rotor assembly. Background Art

[0002] With the improvement of the power density of motors, the energy density of motors increases, and the magnetic field of motors tends to be deeply saturated, resulting in an increase in electromagnetic noise. In related technologies, in order to reduce the electromagnetic vibration and noise caused by torque fluctuations during the operation of motors, vibration damping materials are usually filled between the rotor core and the rotating shaft or the bushing to absorb electromagnetic force waves, so as to reduce the noise of the motor and achieve vibration damping. In related technologies, by filling vibration damping materials between the rotor core and the rotating shaft or the bushing, the effects of noise reduction and vibration damping are poor and need to be improved. Summary of the Invention

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

[0004] In related technologies, the vibration damping rotor assembly includes a permanent magnet, an outer iron core, a rotating shaft, an injection molded body, and a vibration 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 protrudes axially on the upper end plate and / or the lower end plate. The inner iron core is installed on the rotating shaft and embedded in the groove of the annular boss, and the vibration 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 material amount of the vibration damping member is limited, and the noise reduction and vibration damping effects are poor. On the other hand, the materials of the injection molded part and the vibration damping ring are different, and there is no connection between the vibration damping rings at the ends of the outer iron core. Gaps are likely to appear at the interface between the injection molded part and the vibration damping ring, and reliability problems are likely to occur due to different coefficients such as thermal expansion during operation. Moreover, 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 vibration damping rotor assembly needs to go through two steps of injection molding and placing the vibration damping ring during the production process, the process is complex, and the defective rate is high during mass production.

[0005] The present invention aims to solve at least one of the technical problems in related technologies to a certain extent, and can increase the material amount of the vibration damping member to improve the noise reduction and vibration damping effects without affecting the electromagnetic field magnetic circuit.

[0006] Therefore, an embodiment of the present invention provides a vibration damping rotor assembly that can increase the material amount of the vibration damping member and has good noise reduction and vibration damping effects.

[0007] An embodiment of the present invention also provides a motor.

[0008] A damping rotor assembly according to an embodiment of the first aspect of the present invention includes a rotor core, a permanent magnet, a rotating shaft, and a first end damping member. The rotor core has a magnet slot and a rotating shaft hole. The permanent magnet is disposed in the magnet slot. The rotating shaft is disposed in the rotating shaft hole, and the first end and the second end of the rotating shaft extend out of the rotating shaft hole. There is a gap between the rotating shaft and the rotor core. The first end damping member is disposed on the first end face of the rotor core and is connected to the rotor core. In the axial direction of the rotor core, the first end of the permanent magnet extends out of the magnet slot and is fitted in the first end damping member, or the first end of the permanent magnet retracts into the magnet slot so that a part of the first end damping member is fitted in the magnet slot. The first end damping member is directly fitted with the rotating shaft or is fitted with the rotating shaft through a first transmission member disposed in the first end damping member.

[0009] For the damping rotor assembly according to the embodiment of the present invention, by providing a first end damping member on the first end face of the rotor core, the material amount of the damping member can be large. For example, the first end damping member can be consistent with the outer diameter of the rotor core, and the thickness can be increased without limitation, thereby fully improving the damping performance and reducing the vibration noise. In addition, in the axial direction of the rotor core, the first end of the permanent magnet extends out of the magnet slot and is fitted in the first end damping member, or the first end of the permanent magnet retracts into the magnet slot so that a part of the first end damping member is fitted in the magnet slot, which can always provide a connection structure between the first end damping member and the rotor core, thereby improving the reliability and tightness of the connection between the first end damping member and the rotor core. There is no problem of different thermal expansion coefficients, improving the reliability of the rotor assembly. Moreover, only the damping member needs to be provided during the production process, and the preparation process is relatively simple, reducing the defective rate of mass production.

[0010] In some embodiments, when the first end damping member is fitted with the rotating shaft through the first transmission member, a part of the first end damping member is also directly fitted with the rotating shaft.

[0011] In some embodiments, when the first end damping member is fitted with the rotating shaft through the first transmission member, the minimum clearance between the first transmission member and the rotor core in the axial direction of the rotor core is greater than or equal to 0.3 mm.

[0012] In some embodiments, the first transmission member includes a first base body and a first convex platform. The first convex platform protrudes from the first base body toward the first end face of the rotor core, and the rotating shaft penetrates through the first base body and the first convex platform.

[0013] In some embodiments, the minimum distance L1 between the first convex platform and the first end face of the rotor core in the axial direction of the rotor core satisfies L1 > 0.5 mm.

[0014] In some embodiments, the minimum clearance between the first 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 clearance between the first 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 length of the permanent magnet is not equal to the length of the magnet slot.

[0017] In some embodiments, both the first end and the second end of the permanent magnet extend out of the magnet slot; or both the first end and the second end of the permanent magnet retract into the magnet slot; or one of the first end and the second end of the permanent magnet retracts into the magnet slot, and the other of the first end and the second end of the permanent magnet is flush with the magnet slot.

[0018] In some embodiments, the damping rotor assembly further includes a second end damping member, the second end damping member is disposed on the second end face of the rotor core and connected to the rotor core, the second end of the permanent magnet extends out of the magnet slot and is fitted in the second end damping member or the second end of the magnet slot retracts into the magnet slot so that a part of the second end damping member is fitted in the magnet slot, and the second end damping member is directly fitted with the rotating shaft or is fitted with the rotating shaft through a second transmission member disposed in the second end damping member.

[0019] In some embodiments, when the second end damping member is fitted with the rotating shaft through the second transmission member, a part of the second end damping member is also directly fitted with the rotating shaft.

[0020] In some embodiments, the damping rotor assembly further includes an intermediate connecting damping member, the rotor core has an axially through hole located between adjacent permanent magnet slots, the intermediate connecting damping member is disposed in the axially through hole, the first end of the intermediate connecting damping member is connected to the first end damping member, and the second end of the intermediate connecting damping member is connected to the second end damping member.

[0021] In some embodiments, the first end damping member, the second end damping member, and the intermediate connecting damping member are integrally injection molded from a viscoelastic material.

[0022] In some embodiments, the outer peripheral surface of the first transmission member is provided with first transmission radial protrusions and first transmission radial opening grooves formed between the first transmission radial protrusions. The inner peripheral wall of the first end damping member is provided with first damping radial inner protrusions and first damping radial inner opening grooves located between the first damping radial inner protrusions. The first damping radial inner protrusions are fitted into the first transmission radial opening grooves, and the first transmission radial protrusions are fitted into the first damping radial inner opening grooves.

[0023] In some embodiments, each of the first transmission radial opening grooves and the first damping radial inner opening grooves is a tapered groove with a constricted mouth.

[0024] In some embodiments, the rotor core is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotor core. The rotor punching sheets include fully connected bridge punching sheets and semi-connected bridge punching sheets. The rotor core has a first end, a second end, and an intermediate section located between the first end and the second end. The first end and the second end are formed by stacking the fully connected bridge sheets, and the intermediate section is formed by stacking the semi-connected bridge punching sheets. Among the adjacent semi-connected bridge punching sheets in the intermediate section, one semi-connected bridge punching sheet rotates one magnetic pole circumferentially relative to the other semi-connected bridge punching sheet along the rotor core.

[0025] In some embodiments, the first transmission member and the second transmission member are made of metal, resin, or plastic.

[0026] The motor according to the embodiment of the second aspect of the present invention includes the damping rotor assembly described in any of the above embodiments. By adopting the above damping rotor assembly, the motor runs with small vibration and low noise. Description of the Drawings

[0027] Figure 1 is a perspective view of a damping rotor assembly according to an embodiment of the present invention.

[0028] Figure 2 is a perspective view of a damping rotor assembly according to another embodiment of the present invention.

[0029] Figure 3 is Figure 2 a schematic structural diagram of the shown damping rotor assembly.

[0030] Figure 4 is Figure 3 a cross-sectional view of the shown damping rotor assembly.

[0031] Figure 5 is a schematic diagram of a semi-connected bridge punching sheet of a rotor assembly according to an embodiment of the present invention.

[0032] Figure 6 is a schematic diagram of a fully connected bridge punching sheet of a rotor assembly according to an embodiment of the present invention.

[0033] Figure 7 is Figure 1 Another axial sectional view of the rotor assembly shown.

[0034] Figure 8 is Figure 1 Side view of the rotor assembly shown.

[0035] Figure 9 Another three-dimensional schematic diagram of the transmission member of the rotor assembly according to an embodiment of the present invention.

[0036] Figure 10 is a comparison diagram of the damping ratio of the rotor assembly according to an embodiment of the present invention and the prior art.

[0037] Reference numerals:

[0038] Vibration damping rotor assembly 100;

[0039] Rotor core 10; magnet slot 102; shaft hole 101; axially through hole 103; fully connected bridge punching 110; semi-connected bridge punching 120; punching body part 111; outer magnetic bridge 112; inner magnetic bridge 113; magnetic pole 114; protrusion 115;

[0040] Permanent magnet 20;

[0041] Shaft 30;

[0042] First transmission member 51; first transmission radial protrusion 510; first transmission radial open slot 511;

[0043] Second transmission member 52; second transmission radial protrusion 520; second transmission radial open slot 521;

[0044] First end vibration damping member 61; first damping radial inner protrusion 616; first damping radial inner open slot 615; first mating slot 617;

[0045] Second end vibration damping member 62; second damping radial inner protrusion 626; second damping radial inner open slot 625; second mating slot 627;

[0046] Intermediate connecting vibration damping member 64. Detailed implementation manners

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

[0048] As Figures 1-6As shown, a vibration damping rotor assembly 100 according to an embodiment of the present invention includes a rotor core 10, a permanent magnet 20, a rotating shaft 30, and a first end vibration damping member 61.

[0049] The rotor core 10 has a magnet groove 102 and a rotating shaft hole 101. As Figure 1 and Figure 2 shown, the rotating shaft hole 101 is provided at a substantially central position of the rotor core 10 and penetrates the rotor core 10 along the axial direction of the rotor core 10 ( Figure 1 and Figure 2 the left - right direction in the figure). A plurality of magnet grooves 102 are provided, and the plurality of magnet grooves 102 are evenly spaced along the circumferential direction of the rotor core 10.

[0050] The permanent magnet 20 is arranged in the magnet groove 102. As Figure 1 and Figure 2 shown, the permanent magnet 20 is plural and is correspondingly installed in the magnet groove 102.

[0051] The rotating shaft 30 is arranged in the rotating shaft hole 101. The first end ( Figure 1 the left end of the rotating shaft 30 in the figure) and the second end ( Figure 1 the right end of the rotating shaft 30 in the figure) of the rotating shaft 30 extend out of the rotating shaft hole 101, and there is a gap between the rotating shaft 30 and the rotor core 10. As Figure 1 and Figure 2 shown, the axial direction of the rotating shaft 30 is substantially the same as the axial direction of the rotor core 10.

[0052] The first end vibration damping member 61 is arranged on the first end face ( Figure 1 the left end face of the rotor core 10 in the figure) of the rotor core 10 and is connected to the rotor core 10. In the axial direction of the rotor core 10, the first end ( Figure 1 the left end of the permanent magnet 20 in the figure) of the permanent magnet 20 extends out of the magnet groove 102 and is fitted in the first end vibration damping member 61, or the first end of the permanent magnet 20 retracts into the magnet groove 102 so that a part of the first end vibration damping member 61 is fitted in the magnet groove 102. In other words, at least a part of the first end vibration damping member 61 extends into the magnet groove 102, or a part of the permanent magnet 20 extends into the first end vibration damping member 61. Thus, there is always a connection structure between the first end vibration damping member 61 and the rotor core 10, making the connection between the first end vibration damping member 61 and the rotor core 10 reliable.

[0053] As Figure 1As shown, the first end damping member 61 is provided on the left end face of the rotor core 10. In the left-right direction, the permanent magnet 20 is inserted into the magnet slot 102, and the left end of the permanent magnet 20 extends out of the magnet slot 102. A plurality of first fitting grooves 617 are formed on the right side surface of the first end damping member 61 at intervals in the circumferential direction of the first end damping member 61. The left ends of the plurality of permanent magnets 20 are in one-to-one correspondence and adaptation with the plurality of first fitting grooves 617, and the left end of any one permanent magnet 20 is embedded in the corresponding first fitting groove 617.

[0054] The first end damping member 61 is directly engaged with the rotating shaft 30. As Figure 1 shown, the first end damping member 61 is sleeved on the rotating shaft 30 and is directly engaged with the rotating shaft 30. The rotor core 10 can drive the first end damping member 61 to rotate, and the first end damping member 61 directly drives the rotating shaft 30 to rotate. In other words, since there is a gap between the inner peripheral wall of the 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 through the first end damping member 61.

[0055] Alternatively, as Figure 2 shown, it is engaged with the rotating shaft 30 through the first transmission member 51 provided in the first end damping member 61. Specifically, the first end damping member 61 has an inner hole, the first transmission member 52 is provided in the inner space of the inner hole, and the first transmission member 51 is sleeved on the rotating shaft 30 and is directly engaged with the rotating shaft 30. The rotor core 10 drives the first end damping member 61 to rotate, and the first transmission member 51 rotates together with the first end damping member 61, thereby driving the rotating shaft 30 to rotate through the first transmission member 51.

[0056] According to the damping rotor assembly of the embodiment of the present invention, by providing the first end damping member on the first end face of the rotor core, the material amount of the damping member can be very large. For example, the first end damping member can be consistent with the outer diameter of the rotor core, and the thickness can be increased without limitation, thereby fully improving the damping performance and reducing the vibration noise. In addition, in the axial direction of the rotor core, the first end of the permanent magnet extends out of the magnet slot and is fitted in the first end damping member or the first end of the permanent magnet is retracted into the magnet slot so that a part of the first end damping member is fitted in the magnet slot, which can always provide a connection structure between the first end damping member and the rotor core, thereby improving the reliability and tightness of the connection between the first end damping member and the rotor core; there is no problem of different thermal expansion coefficients, improving the reliability of the rotor assembly, and only the damping member needs to be provided during the production process, the preparation process is relatively simple, and the defect rate of mass production is reduced.

[0057] In some embodiments, as Figure 4As shown, when the first end damping member 61 is engaged with the rotating shaft 30 through the first transmission member 51, a part of the first end damping member 61 is also directly engaged with the rotating shaft 30. In other words, while the first transmission member 51 is engaged with the rotating shaft 30, a part of the first end damping member 61 fills the gap between the first transmission member 51 and the rotor core 10, and this part is directly engaged with the rotating shaft 30. Thereby, the filling amount of the first end damping member can be increased, and the damping performance can be improved.

[0058] As Figure 4 shown, the rotating shaft 30 penetrates through a part of the first end damping member 61 and the first transmission member 51 in the left-right direction, and the rotating shaft 30 is directly engaged with a part of the first end damping member 61 and the first transmission member 51. When the rotor core 10 rotates, it drives the first end damping member 61 to rotate, and then jointly drives the rotating shaft 30 to rotate through a part of the first end damping member 61 and the first transmission member 51.

[0059] In some embodiments, when the first end damping member 61 is engaged with the rotating shaft 30 through the first transmission member 51, the minimum clearance between the first transmission member 51 and the rotor core 10 in the axial direction of the rotor core 10 is greater than or equal to 0.3 mm.

[0060] The first transmission member 51 includes a first base body 513 and a first boss 514. The first boss 514 protrudes from the first end face of the first base body 513 towards the rotor core 10, and the rotating shaft 30 penetrates through the first base body 513 and the first boss 514.

[0061] As Figure 1 and 7 shown in FIG. 9, the first boss 514 faces the left end face of the rotor core 10. The first base body 513 is engaged with the first central hole 617 of the first end damping member 61, and the first boss 514 is engaged inside the first end damping member 61. Both the first base body 513 and the first boss 514 are provided with first through holes, and the rotating shaft 30 penetrates through the first base body 513 and the first boss 514 through the corresponding first through holes.

[0062] The minimum distance L1 between the first boss 514 and the first end face of the rotor core 10 in the axial direction of the rotor core 10 is such that L1 > 0.5 mm. Thereby, while increasing the amount of material of the damping member, the connection between the damping member and the rotor core is made more reliable.

[0063] In some embodiments, as Figure 7 shown, the minimum clearance L2 between the first boss 514 and the permanent magnet 20 in the radial direction of the rotor core 10 is such that L2 > 0.5 mm. Thereby, while increasing the amount of material of the damping member, the connection between the damping member and the rotor core is made more reliable.

[0064] In some embodiments, as Figure 7As shown, the minimum clearance L3 between the first base 513 and the permanent magnet 20 in the axial direction of the rotor core 10 satisfies L3 > 0.5 mm. Thus, while increasing the material amount of the vibration damping member, the connection between the vibration damping member and the rotor core becomes more reliable.

[0065] It can be understood that the first transmission member 51 of the present application is not limited to Figure 9 As shown, for example, in some other embodiments, the first transmission member 51 has no boss.

[0066] In some embodiments, as Figure 1 As shown, the length of the permanent magnet 20 is not equal to the length of the magnet slot 102. Thus, it can be ensured that at least one end of the permanent magnet 20 extends out of or retracts into the magnet slot 102, so that a part of the permanent magnet 20 extends into the first end vibration damping member 61, or a part of the first end vibration damping member 61 extends into the magnet slot 102. The rotor assembly of this embodiment not only improves the electromagnetic performance of the motor and reduces energy consumption, but also enables the vibration damping member of the rotor assembly to withstand a greater torque.

[0067] In some embodiments, both the first end and the second end of the permanent magnet 20 extend out of the magnet slot 102. In some other embodiments, both the first end and the second end of the permanent magnet 20 retract into the magnet slot 102. In still some other embodiments, one of the first end and the second end of the permanent magnet 20 retracts into the magnet slot 102, and the other of the first end and the second end of the permanent magnet 20 is flush with the magnet slot 20.

[0068] In some embodiments, as Figure 1 and Figure 2 As shown, the damping rotor assembly 100 further includes a second end vibration damping member 62, and the second end vibration damping member 62 is provided on the second end face ( Figure 1 the right end face of the rotor core 10 in the middle) of the rotor core 10 and is connected to the rotor core 10. Thus, vibration damping members can be provided at both ends of the rotor core 10, achieving balanced vibration damping at both ends of the rotor core. The overall vibration damping of the damping rotor assembly is stable and the vibration damping effect is better.

[0069] The second end ( Figure 1 the right end of the permanent magnet 20 in the middle) of the permanent magnet 20 extends out of the magnet slot 102 and is fitted in the second end vibration damping member 62, or the second end of the magnet slot 102 retracts into the magnet slot 102 so that a part of the second end vibration damping member 62 is fitted in the magnet slot 102. In other words, at least a part of the second end vibration damping member 62 extends into the magnet slot 102, or a part of the permanent magnet 20 extends into the second end vibration damping member 62. Thus, there is always a connection structure between the second end vibration damping member 62 and the rotor core 10, making the connection between the second end vibration damping member and the rotor core reliable.

[0070] As Figure 1As shown, the second end damping member 62 is connected to the right end face of the rotor core 10. In the left-right direction, the permanent magnets 20 are disposed through the magnet slots 102, and the right ends of the permanent magnets 20 extend out of the magnet slots 102. A plurality of second mating grooves 627 are formed on the left side surface of the second end damping member 62 at circumferential intervals along the second end damping member 62. The right ends of the plurality of permanent magnets 20 are in one-to-one correspondence and fit with the plurality of second mating grooves 627, and the right end of any one permanent magnet 20 is embedded in the corresponding second mating groove 627.

[0071] The second end damping member 62 is directly mated with the rotating shaft 30. Thus, when the rotor core 10 drives the first end damping member 61 to rotate, the first end damping member 61 directly drives the rotating shaft 30 to rotate.

[0072] Alternatively, it is mated with the rotating shaft 30 through a second transmission member 52 provided in the second end damping member 62. As Figures 1-3 shown, the second end damping member 62 is connected to the right end face of the rotor core 10. The rotating shaft 30 penetrates through the rotor core 10 and the second end damping member 62 in the left-right direction. The second end damping member 62 has an inner hole penetrating left and right. The second transmission member 52 is disposed in the inner space of the inner hole and the second transmission member 52 is sleeved on the rotating shaft 30. The second end damping member 62 drives the rotating shaft 30 to rotate through the second transmission member 52. Thus, when the rotor core 10 rotates, it drives the second end damping member 62 to rotate. The second end damping member 62 drives the second transmission member 52 to rotate, and further drives the rotating shaft 30.

[0073] In some embodiments, as Figure 4 shown, when the second end damping member 62 is mated with the rotating shaft 30 through the second transmission member 52, a part of the second end damping member 62 is also directly mated with the rotating shaft 30. In other words, while the second transmission member 52 is mated with the rotating shaft 30, a part of the second end damping member 62 fills the gap between the second transmission member 52 and the rotor core 10, and this part is directly mated with the rotating shaft 30. Thus, the filling amount of the second end damping member can be increased, and the damping performance can be improved.

[0074] As Figure 4 shown, the rotating shaft 30 penetrates through a part of the second end damping member 62 and the second transmission member 52 in the left-right direction, and the rotating shaft 30 is directly mated with a part of the second end damping member 62 and the second transmission member 52. The rotor core 10 drives the second end damping member 62 to rotate. The part of the second end damping member 62 directly mated with the rotating shaft 30 and the second transmission member 52 jointly drive the rotating shaft 30 to rotate.

[0075] In some embodiments, the second transmission member 52 includes a second base body 523 and a second boss 524. The second boss 524 protrudes from the second end face of the second base body 523 facing the rotor core 10. The rotating shaft 30 penetrates through the second base body 523 and the second boss 524.

[0076] As shown Figure 1 , 7 and as shown in Fig. 9, the second boss 524 faces the right end face of the rotor core 10. The second base 523 is engaged with the second central hole 627 of the second end damping member 62. The second boss 524 is internally engaged within the second end damping member 62. Both the second base 523 and the second boss 524 are provided with first through holes, and the rotating shaft 30 passes through the second base 523 and the second boss 524 through the corresponding first through holes.

[0077] In some embodiments, the minimum distance L1 between the second boss 524 and the right end face of the rotor core 10 in the axial direction of the rotor core 10 satisfies L1 > 0.5 mm; the minimum clearance L2 between the second boss 524 and the permanent magnet 20 in the radial direction of the rotor core 10 satisfies L2 > 0.5 mm. Thereby, while increasing the amount of material of the damping member, the connection between the damping member and the rotor core is made more reliable.

[0078] In some embodiments, the minimum clearance L3 between the second base 523 and the permanent magnet 20 in the axial direction of the rotor core 10 satisfies L3 > 0.5 mm. Thereby, while increasing the amount of material of the damping member, the connection between the damping member and the rotor core is made more reliable.

[0079] It can be understood that the second transmission member 52 of the present application is not limited to Figure 9 as shown. For example, in some other embodiments, the second transmission member 52 has no boss.

[0080] In some embodiments, as shown Figure 1 and Figure 2 , the damping rotor assembly 100 further includes an intermediate connecting damping member 64. The rotor core 10 has an axially through hole 103 located between adjacent permanent magnet slots. The intermediate connecting damping member 64 is disposed within the axially through hole 103. The first end of the intermediate connecting damping member 64 ( Figure 1 the left end of the intermediate connecting damping member 64 in Fig.) is connected to the first end damping member 61, and the second end of the intermediate connecting damping member 64 ( Figure 1 the right end of the intermediate connecting damping member 64 in Fig.) is connected to the second end damping member 62.

[0081] As shown Figure 1 , there are a plurality of axially through holes 103, and the plurality of axially through holes 103 are circumferentially spaced apart along the rotor core 10. The plurality of intermediate connecting damping members 64 are respectively engaged within the plurality of axially through holes 103. Thereby, while increasing the amount of material of the damping member, the connection between the damping member and the rotor core is made more reliable.

[0082] In some embodiments, the first end damping member 61, the second end damping member 62, and the intermediate connecting damping member 64 are integrally injection-molded from a viscoelastic material. The viscoelastic material can be rubber, thermoplastic material, etc. By using the viscoelastic material, the application can significantly absorb the energy generated by resonance and achieve the damping effect.

[0083] As Figure 10 shown, by designing the end face of the rotor core as a full viscoelastic material in this application, the rotor damping ratio can be significantly improved. Compared with a common rotor (rigid connection), an end structure with an injection-molded part (end plate) and a damping ring, the end structure of this application using a full viscoelastic material has a larger damping ratio. Moreover, the connection between the damping member and the rotor core is tight and reliable, not easy to detach, improving the stability.

[0084] In some embodiments, the loss factor of the viscoelastic material is greater than or equal to 0.15, so that the electromagnetic force wave can be effectively absorbed and attenuated when the motor rotor is running.

[0085] Furthermore, the Shore hardness of the viscoelastic material is 20 degrees - 80 degrees, thereby improving the manufacturability of the motor. For example, the Shore hardness is 30 degrees, 40 degrees, 50 degrees.

[0086] In some embodiments, as Figures 2-4 shown, on the outer peripheral surface of the first transmission member 51, there are first transmission radial protrusions 510 and first transmission radial open grooves 511 formed between the first transmission radial protrusions 510.

[0087] On the inner peripheral wall of the first end damping member 61, there are first damping radial inner protrusions 616 and first damping radial inner open grooves 615 located between the first damping radial inner protrusions 616. The first damping radial inner protrusions 616 are fitted in the first transmission radial open grooves 511, and the first transmission radial protrusions 510 are fitted in the first damping radial inner open grooves 615.

[0088] As Figure 2 shown, on the outer peripheral surface of the first transmission member 51, a plurality of first transmission radial protrusions 510 are formed at intervals in the circumferential direction of the first transmission member 51, and a first transmission radial open groove 511 is formed between any two adjacent first transmission radial protrusions 510.

[0089] As Figure 2 shown, the first end damping member 61 has an inner hole penetrating in the left-right direction. The first transmission member 51 is located in the space defined by the inner hole. On the inner peripheral wall of the inner hole, a plurality of first damping radial inner protrusions 616 are formed at intervals in the circumferential direction of the first end damping member 61, and a first damping radial inner open groove 615 is formed between any two adjacent first damping radial inner protrusions 616.

[0090] AsFigure 2 , Figure 4 As shown in Figure 4 , when the first transmission member 51 is adapted to the first end damping member 61, a plurality of first transmission radial protrusions 510 and a plurality of first damping radial inner opening grooves 615 are in one-to-one correspondence and cooperation. Any one of the first transmission radial protrusions 510 is embedded in the corresponding first damping radial inner opening groove 615. A plurality of first transmission radial opening grooves 511 and a plurality of first damping radial inner protrusions 616 are in one-to-one correspondence and cooperation. Any one of the first damping radial inner protrusions 616 is embedded in the corresponding first transmission radial opening groove 511.

[0091] Thus, the cooperation between the plurality of first damping radial inner protrusions 616 and the plurality of first transmission radial opening grooves 511, and the cooperation between the plurality of first transmission radial protrusions 510 and the plurality of first damping radial inner opening grooves 615 can be utilized to make the first transmission member and the first end damping member fit tightly, while preventing relative rotation between the first transmission member and the first end damping member. Moreover, there is no redundant connection structure between the first transmission member and the first end damping member, which is convenient for disassembly and assembly and has high assembly efficiency.

[0092] On the outer peripheral surface of the second transmission member 52, there are provided second transmission radial protrusions 520 and second transmission radial opening grooves 521 formed between the second transmission radial protrusions 520. On the inner peripheral wall of the second end damping member 62, there are provided second damping radial inner protrusions 626 and second damping radial inner opening grooves 625 located between the second damping radial inner protrusions 626. The second damping radial inner protrusions 626 are fitted in the second transmission radial opening grooves 521, and the second transmission radial protrusions 520 are fitted in the second damping radial inner opening grooves 625. It can be understood that the cooperation between the second transmission member 52 and the second end damping member 62 is the same as the cooperation mode between the above-mentioned first end damping member 61 and the first transmission member 51, and will not be elaborated here.

[0093] In some embodiments, as Figure 2 shown, each of the first transmission radial opening groove 511, the second transmission radial opening groove 521, the first damping radial inner opening groove 615 and the second damping radial inner opening groove 625 is a tapered groove with a reduced opening. Thus, the inclined surface of the tapered groove can be utilized to guide the assembly, improving the assembly efficiency, and the reduced opening can be utilized to prevent slippage and improve the connection reliability.

[0094] Specifically, the taper angle of the tapered groove can be designed to be ≥5°, and the tapered groove tapers radially outward, which can enhance the bonding force between the mating components and make it more firm.

[0095] In some embodiments, as Figure 1 , Figure 5 and Figure 6As shown, the rotor core 10 is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotor core 10. The rotor punching sheets include full-bridge punching sheets 110 and half-bridge punching sheets 120. The rotor core 10 has a first end portion, a second end portion, and an intermediate section located between the first end portion and the second end portion. The first end portion and the second end portion are formed by stacking full-bridge sheets, and the intermediate section is formed by stacking half-bridge punching sheets 120.

[0096] As Figure 5 and Figure 6 shown, the rotor punching sheet includes a punching sheet body portion 111, an outer magnetic bridge 112, an inner magnetic bridge 113, and magnetic poles 114. A plurality of magnetic poles 114 are arranged at intervals along the circumferential direction of the rotor core 10, and at least part of the magnetic poles 114 are connected to the punching sheet body portion 111 through the inner magnetic bridge 113. Among the plurality of rotor punching sheets forming the rotor core 10, there are both full-bridge punching sheets 110 and half-bridge punching sheets 120. The full-bridge punching sheets 110 are located at both end portions of the rotor core 10, and the half-bridge punching sheets 120 are located in the middle of the rotor core 10.

[0097] As Figure 6 shown, among the plurality of magnetic poles 114 of the full-bridge punching sheet 110, each magnetic pole 114 is connected to the punching sheet body portion 111 through an inner magnetic bridge 113. A plurality of protrusions 115 arranged at intervals are provided on the outer circumference of the punching sheet body portion 111, and one protrusion 115 is provided between adjacent inner magnetic bridges 113. The outer magnetic bridge 112 of the full-bridge punching sheet 110 is closed.

[0098] As Figure 5 shown, among the plurality of magnetic poles 114 of the half-bridge punching sheet 120, a part of the magnetic poles 114 are connected to the punching sheet body portion 111 through the inner magnetic bridge 113, and the other part of the magnetic poles 114 are spaced apart from the punching sheet body portion 111 in the radial direction of the rotor core 10. Among them, a part of the magnetic poles 114 and the other part of the magnetic poles 114 are arranged alternately along the circumferential direction of the rotor core 10. The outer magnetic bridge 112 of the half-bridge punching sheet 120 is disconnected between adjacent magnetic poles 114.

[0099] In this embodiment, by arranging the full-bridge punching sheet 110 at the end portion of the rotor core 10, it is not only beneficial to the mold sealing material of the injection molding process, preventing the injection liquid from leaking out and causing burrs and flash on the molded product, but also can improve the stiffness and strength of the rotor core.

[0100] In addition, among adjacent half-bridge punching sheets 120 in the intermediate section, one half-bridge punching sheet 120 rotates one magnetic pole 114 along the circumferential direction of the rotor core 10 relative to the other half-bridge punching sheet 120. Thus, the inner magnetic bridges 113 of the rotor core 10 form an alternately connected and disconnected structure in the axial direction, improving the electromagnetic performance of the motor and thereby reducing energy consumption.

[0101] In some embodiments, the first transmission member 51 and the second transmission member 52 are made of metal, resin, or plastic. Thus, the transmission members have relatively high hardness, ensuring the reliability and sensitivity of transmission and enhancing the structural strength of the damping rotor assembly.

[0102] The following refers to the attached Figures 1-6 to describe some specific exemplary damping rotor assemblies 100 according to the present invention.

[0103] As Figures 1-6 shown, the damping rotor assembly 100 includes a rotor core 10, a permanent magnet 20, a rotating shaft 30, a first end damping member 61, a second end damping member 62, a first transmission member 51, a second transmission member 52, and an intermediate connecting damping member 64.

[0104] The rotor core 10 has a rotating shaft hole 101, a plurality of magnet slots 102, and a plurality of axially through holes 103. The rotating shaft hole 101 is provided at a substantially central position of the rotor core 10 and axially penetrates the rotor core 10. The plurality of magnet slots 102 are uniformly spaced around the rotating shaft hole 101 along the circumferential direction of the rotor core 10. One axially through hole 103 is provided between adjacent magnet slots 102.

[0105] The rotor core 10 is formed by stacking a plurality of rotor punching sheets along the axial direction of the rotor core 10, where the punching sheets at the left end part and the right end part among the plurality of rotor punching sheets are full-bridge sheets, and the punching sheets at the middle part are semi-bridge punching sheets 120.

[0106] The rotor punching sheet includes a punching sheet body part 111, an outer magnetic bridge 112, an inner magnetic bridge 113, and magnetic poles 114. Among the plurality of magnetic poles 114 of the full-bridge punching sheet 110, each magnetic pole 114 is connected to the punching sheet body part 111 through an inner magnetic bridge 113. A plurality of spaced protrusions 115 are provided on the outer periphery of the punching sheet body part 111, and one protrusion 115 is provided between adjacent inner magnetic bridges 113. The outer magnetic bridge 112 of the full-bridge punching sheet 110 is closed.

[0107] The outer magnetic bridge 112 of the semi-bridge punching sheet 120 is disconnected between adjacent magnetic poles 114. Among the plurality of magnetic poles 114 of the semi-bridge punching sheet 120, some magnetic poles 114 are connected to the punching sheet body part 111 through inner magnetic bridges 113, and the other part of the magnetic poles 114 are radially spaced from the punching sheet body part 111 in the rotor core 10, where some magnetic poles 114 and the other part of the magnetic poles 114 are alternately arranged along the circumferential direction of the rotor core 10. Among adjacent semi-bridge punching sheets 120 in the middle part, one semi-bridge punching sheet 120 rotates one magnetic pole 114 along the circumferential direction of the rotor core 10 relative to the other semi-bridge punching sheet 120. Thus, the inner magnetic bridges 113 of the rotor core 10 form an alternately connected and disconnected structure in the axial direction, which can improve the electromagnetic performance of the motor and thus reduce energy consumption.

[0108] The axial direction of the rotating shaft 30 is generally consistent with the axial direction of the rotor core 10 and is arranged on the rotor core 10 through the rotating shaft hole 101, and there is a gap between the rotating shaft 30 and the rotor core 10.

[0109] A plurality of permanent magnets 20 are respectively arranged in a plurality of magnet slots 102 correspondingly, so that the plurality of permanent magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10. The length of the permanent magnet 20 is greater than that of the magnet slot 102, and both ends of the permanent magnet 20 extend out of the magnet slot 102.

[0110] The first end damping member 61 is arranged on the left end face of the rotor core 10. The right end face of the first end damping member 61 is provided with a plurality of first mating grooves 617 distributed at intervals along the circumferential direction of the first end damping member. The left ends of the plurality of permanent magnets 20 extend out of the magnet slots 102, and the left ends of the plurality of permanent magnets 20 are in one-to-one correspondence and cooperation with the plurality of first mating grooves 617, and the left end of any one permanent magnet 20 is embedded in the corresponding first mating groove 617. The second end damping member 62 is arranged on the right end face of the rotor core 10. The left side surface of the second end damping member 62 is formed with a plurality of second mating grooves 627 distributed at intervals along the circumferential direction of the second end damping member 62. The right ends of the plurality of permanent magnets 20 extend out of the magnet slots 102, and the right ends of the plurality of permanent magnets 20 are in one-to-one correspondence and cooperation with the plurality of second mating grooves 627, and the right end of any one permanent magnet 20 is embedded in the corresponding second mating groove 627.

[0111] A plurality of intermediate connecting damping members 64 are arranged in the axially through hole 103. The left end of the intermediate connecting member extends out of the axially through hole 103 and is connected to the first end damping member 61, and the right end of the intermediate connecting damping member 64 extends out of the axially through hole 103 and is connected to the second end damping member 62.

[0112] The first transmission member 51 and the second transmission member 52 are sleeved on the rotating shaft 30. The first end damping member 61 has a through inner hole. The first transmission member 51 is arranged in the inner hole space of the inner hole. The inner circumferential surface of the first end damping member 61 is provided with a plurality of first damping radial inner protrusions 616 arranged at intervals along the circumferential direction of the first end damping member 61. A first damping radial inner opening groove 615 is formed between any two adjacent first damping radial inner protrusions 616. The outer circumferential surface of the first transmission member 51 is formed with a plurality of second transmission radial protrusions arranged at intervals along the circumferential direction of the second transmission member 52. A first transmission radial opening groove 511 is formed between any two adjacent second transmission radial protrusions 520.

[0113] When the first transmission member 51 is adapted to the first end damping member 61, a plurality of first transmission radial protrusions 510 are in one-to-one correspondence and cooperation with a plurality of first damping radial inner opening grooves 615. Any one of the first transmission radial protrusions 510 is embedded in the corresponding first damping radial inner opening groove 615. A plurality of first transmission radial opening grooves 511 are in one-to-one correspondence and cooperation with a plurality of first damping radial inner protrusions 616. Any one of the first damping radial inner protrusions 616 is embedded in the corresponding first transmission radial opening groove 511.

[0114] The second end damping member 62 has an inner hole penetrating from left to right. The second transmission member 52 is arranged in the inner hole space of the inner hole. The cooperation mode between the second transmission member 52 and the second end damping member 62 is the same as that between the first transmission member 51 and the first end damping member 61, and will not be elaborated here.

[0115] When the rotor core 10 rotates, the first end damping member 61 and the second end damping member 62 rotate therewith. The first end damping member 61 drives the first transmission member 51 to rotate, and the second end damping member 62 drives the second transmission member 52 to rotate. The first transmission member 51 and the second transmission member 52 simultaneously drive the rotating shaft 30 to rotate.

[0116] Each of the first transmission radial opening groove 511, the second transmission radial opening groove 521, the first damping radial inner opening groove 615 and the second damping radial inner opening groove 625 is a tapered groove with a reduced opening. Thus, the inclined surface of the tapered groove can be used to guide the assembly, improving the assembly efficiency, and the reduced opening can be used to prevent slipping, improving the connection reliability.

[0117] The motor according to the embodiment of the present invention includes the damping rotor assembly 100 of the embodiment of the present invention. By adopting the damping rotor assembly of the present invention, the motor runs with small vibration and low noise.

[0118] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0119] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0120] In the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be 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, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0122] In the present invention, the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0123] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A vibration damping rotor assembly, characterized in that, Comprising: A rotor core having magnet slots and a shaft hole; A permanent magnet disposed in the magnet slots; A shaft disposed in the shaft hole, with the first end and the second end of the shaft protruding from the shaft hole, and there being a gap between the shaft and the rotor core; A first end damping member disposed on the first end face of the rotor core and connected to the rotor core. Axially of the rotor core, the first end of the permanent magnet protrudes from the magnet slot and fits into the first end damping member or the first end of the permanent magnet retracts into the magnet slot so that a part of the first end damping member fits into the magnet slot. The first end damping member is directly engaged with the shaft or engaged with the shaft through a first transmission member disposed in the first end damping member; Further comprising a second end damping member disposed on the second end face of the rotor core and connected to the rotor core. The second end of the permanent magnet protrudes from the magnet slot and fits into the second end damping member or the second end of the magnet slot retracts into the magnet slot so that a part of the second end damping member fits into the magnet slot. The second end damping member is directly engaged with the shaft or engaged with the shaft through a second transmission member disposed in the second end damping member; Further comprising an intermediate connecting damping member. The rotor core has an axially through hole between adjacent permanent magnet slots, and the intermediate connecting damping member is disposed in the axially through hole. The first end of the intermediate connecting damping member is connected to the first end damping member, and the second end of the intermediate connecting damping member is connected to the second end damping member; On the outer peripheral surface of the first transmission member, there are first transmission radial protrusions and first transmission radial open grooves formed between the first transmission radial protrusions. On the inner peripheral wall of the first end damping member, there are first damping radial inner protrusions and first damping radial inner open grooves located between the first damping radial inner protrusions. The first damping radial inner protrusions fit into the first transmission radial open grooves, and the first transmission radial protrusions fit into the first damping radial inner open grooves; The rotor core is formed by stacking a plurality of rotor punching sheets axially along the rotor core. The rotor punching sheets include fully connected bridge punching sheets and semi-connected bridge punching sheets. The rotor core has a first end, a second end, and an intermediate section between the first end and the second end. The first end and the second end are formed by stacking the fully connected bridge sheets, and the intermediate section is formed by stacking the semi-connected bridge punching sheets. Among adjacent semi-connected bridge punching sheets in the intermediate section, one semi-connected bridge punching sheet rotates one magnetic pole circumferentially relative to the other semi-connected bridge punching sheet.

2. The vibration damping rotor assembly according to claim 1, wherein, When the first end damping member is engaged with the shaft through the first transmission member, a part of the first end damping member is also directly engaged with the shaft.

3. The vibration damping rotor assembly according to claim 1, characterized in that, When the first end damping member is engaged with the shaft through the first transmission member, the minimum clearance between the first transmission member and the rotor core axially of the rotor core is greater than or equal to 0.3 mm.

4. The vibration damping rotor assembly according to claim 1, wherein, The first transmission member includes a first base body and a first boss. The first boss protrudes from the first base body toward the first end face of the rotor core, and the rotating shaft penetrates through the first base body and the first boss.

5. The vibration damping rotor assembly according to claim 4, characterized in that, The minimum distance between the first 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 vibration damping rotor assembly according to claim 4, wherein, The minimum clearance between the first boss and the permanent magnet in the radial direction of the rotor core is L2, and L2 > 0.5 mm.

7. The vibration damping rotor assembly according to claim 4, characterized in that The minimum clearance between the first base body and the permanent magnet in the axial direction of the rotor core is L3, and L3 > 0.5 mm.

8. The vibration damping rotor assembly according to claim 1, wherein The length of the permanent magnet is not equal to the length of the magnet slot.

9. The vibration damping rotor assembly according to claim 1, wherein, Both the first end and the second end of the permanent magnet extend out of the magnet slot; or both the first end and the second end of the permanent magnet retract into the magnet slot; or one of the first end and the second end of the permanent magnet retracts into the magnet slot, and the other of the first end and the second end of the permanent magnet is flush with the magnet slot.

10. The vibration damping rotor assembly according to claim 1, characterized in that, When the second end damping member is engaged with the rotating shaft through the second transmission member, a part of the second end damping member is also directly engaged with the rotating shaft.

11. The vibration damping rotor assembly according to claim 10, wherein, The first end damping member, the second end damping member, and the intermediate connecting damping member are integrally injection-molded from a viscoelastic material.

12. The vibration damping rotor assembly according to claim 11, wherein, Each of the first transmission radial opening groove and the first damping radial inner opening groove is a tapered groove with a constricted mouth.

13. The vibration damping rotor assembly according to claim 1, wherein, The first transmission member and the second transmission member are made of metal, resin, or plastic.

14. A motor, characterized in that, It includes a damping rotor assembly according to any one of claims 1-13.

Images