Rotor assembly and motor

Abstract

The utility model provides a rotor assembly and a motor, and the rotor assembly comprises a rotor part which comprises a rotor iron core and a plurality of magnetic shoes, the rotor iron core is provided with a shaft hole, and the inner wall of the shaft hole is provided with one of a first convex part and a first concave part; the rotating shaft assembly comprises a rotating shaft and a shaft sleeve arranged on the rotating shaft in a sleeving mode, the shaft sleeve is installed in the shaft hole, the shaft sleeve and the shaft hole are arranged in a spaced mode, one of a first protruding part and a first concave part is arranged on the outer wall of the shaft sleeve, and the first protruding part is arranged in the first concave part; and the elastic damping piece is at least partially arranged between the shaft sleeve and the inner wall of the shaft hole. According to the scheme, vibration transmitted to the rotating shaft assembly by the rotor component can be reduced, and noise generated when the motor works is reduced. Meanwhile, the size of the rotor assembly is not increased additionally while the vibration reduction effect is ensured, and it is ensured that the size of the rotor assembly is small.

Description

Technical Field

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

[0002] When the motor rotor is working, it is subjected to external force and vibrates. This vibration is transmitted to the shaft, causing the load connected to the shaft to vibrate, thus generating a lot of noise. At the same time, for some smaller IPM (embedded permanent magnet) rotors, due to the limitation of the rotor center hole size, it is impossible to manufacture a vibration-damping rotor that meets both the vibration reduction requirements and the rotor strength requirements.

[0003] Therefore, how to propose a rotor assembly that is relatively small in size and can simultaneously meet the vibration reduction performance and strength requirements of the rotor has become a problem that needs to be solved urgently. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application is to provide a rotor assembly.

[0006] A second aspect of the present application is to provide an electric motor.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the first aspect of the present application provides a rotor assembly, including: a rotor component, including a rotor core and a plurality of magnetic tiles, the rotor core is provided with an axial hole, and the inner wall of the axial hole is provided with one of a first protrusion and a first recessed portion; a rotating shaft assembly, including a rotating shaft and a sleeve sleeved on the rotating shaft, the sleeve is installed in the axial hole and spaced apart from the axial hole, the outer wall of the sleeve is provided with one of a first protrusion and a first recessed portion, and the first protrusion is arranged in the first recessed portion; an elastic vibration damping member, at least partially arranged between the sleeve and the inner wall of the axial hole.

[0008] According to the rotor assembly provided in the present application, it includes a rotor part, a shaft assembly and an elastic vibration damping part. Among them, the shaft assembly and the rotor part are in contact through the elastic vibration damping part. The elastic vibration damping part is elastic and can play a role in buffering and reducing vibration. In this way, part of the vibration on the rotor part can be absorbed by the elastic vibration damping part, thereby reducing the vibration transmitted from the rotor part to the shaft assembly and reducing the noise when the motor is working. At the same time, in the present application, torque can be transmitted through the sleeve on the shaft and the rotor core of the rotor part, and the volume of the sleeve is relatively small. On the one hand, this can reduce the volume of the entire rotor, and on the other hand, it also allows the shaft assembly to be used on the motor rotor with a smaller rotor center hole size. For example, for an IPM rotor, the size of its rotor center hole is small, so it is impossible to install an inner core while also setting a vibration damping structure between the shaft and the rotor part. In the present application, since the existing inner core is replaced by a smaller bushing, there is space for setting a vibration reduction structure between the rotating shaft and the rotor component. In this way, the volume of the rotor assembly is not increased while ensuring the vibration reduction effect, thereby ensuring that the volume of the rotor assembly is relatively small. In this way, the rotor can be easily prepared into a smaller IPM (embedded permanent magnet) rotor.

[0009] Among them, by arranging the first protrusion and the first recess in the shaft sleeve and the shaft hole, the connection between the two can be made more reliable, thus ensuring the torque transmission effect between the shaft sleeve and the rotor component, thereby ensuring the strength of the entire rotor assembly.

[0010] Among them, the elastic vibration damper has a certain elasticity and can be made of a softer material such as rubber. The shaft sleeve needs to transmit power and can be made of a material with a higher hardness. That is, the hardness of the elastic vibration damper is smaller than the hardness of the shaft sleeve.

[0011] Among them, a third positioning structure is provided on the rotating shaft, and a fourth positioning structure is provided on the sleeve. The rotating shaft and the sleeve are positioned and connected by the third positioning structure and the fourth positioning structure. For example, one of a recessed portion and a protruding portion is provided on the rotating shaft, and one of a recessed portion and a protruding portion is provided on the inner side wall of the sleeve. The rotating shaft and the sleeve are positioned and connected by the recessed portion and the protruding portion.

[0012] In any of the above technical solutions, optionally, the shaft sleeve is a first injection-molded part formed on the shaft sleeve by injection molding with the rotating shaft as an injection-molded insert.

[0013] In this technical solution, the shaft can be processed first, and then a molding mold can be set for the sleeve. Then the shaft can be placed in the set mold as an injection molded insert, and then the sleeve can be injection molded on the shaft through the injection molding process. In this way, the injection molded sleeve and the shaft are an integrated structure, so that the connection strength between the two is relatively high, thereby increasing the force bearing capacity of the sleeve and improving the torque transmission effect of the rotor assembly.

[0014] In any of the above technical solutions, optionally, the elastic vibration damping component is a second injection-molded component formed by injection molding with the rotor component and the shaft assembly as an injection-molded insert.

[0015] In this technical solution, the rotor assembly is an injection molding assembly, and the rotor assembly is formed by injection molding. When the rotor assembly is formed by injection molding, the rotor component and the shaft assembly can be placed in the mold as inserts, and then an elastic vibration damping member is formed by injection molding between the rotor component and the shaft assembly, and finally an injection-molded rotor assembly is obtained. In this solution, since the rotor assembly is formed by injection molding, the connection between the rotor component and the shaft assembly is more reliable, thereby ensuring the connection strength between the rotor component and the elastic vibration damping member and preventing the elastic vibration damping member from falling off.

[0016] In any of the above technical solutions, optionally, one of the key and the keyway is provided on the outer wall of the rotating shaft, and the other of the key and the keyway is provided on the inner wall of the sleeve, and the rotating shaft and the sleeve are driven and connected by the key and the keyway.

[0017] In this technical solution, the rotating shaft and the shaft sleeve are connected by a key, which can ensure the connection strength between the rotating shaft and the shaft sleeve and ensure the torque transmission effect between the rotating shaft and the shaft sleeve.

[0018] In any of the above technical solutions, optionally, a plurality of first protrusions and a plurality of second recesses are provided on the inner wall of the shaft hole, and the plurality of first protrusions and the plurality of second recesses are alternately provided; a plurality of first recesses and a plurality of second protrusions are provided on the outer wall of the sleeve, and the plurality of first recesses and the plurality of second protrusions are alternately provided; and the second protrusion is provided in the second recess.

[0019] In this technical solution, a plurality of first protrusions are provided on the shaft hole, and a plurality of second protrusions are also provided on the shaft sleeve. During installation, the first protrusions and the second protrusions can be installed in a staggered manner, so that the first protrusion can correspond to the first recessed portion formed by two adjacent second protrusions, and at the same time, the second protrusion can correspond to the second recessed portion formed by two adjacent first protrusions. In this way, the torque transmission effect between the shaft sleeve and the shaft hole can be ensured through the concave-convex structure on the shaft sleeve and the shaft hole, thereby improving the strength of the entire rotor assembly.

[0020] In any of the above technical solutions, optionally, a first gap is provided between the shaft sleeve and the shaft hole, and a width of the first gap along the radial direction of the shaft hole is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0021] In order to ensure the vibration reduction effect of the elastic vibration reduction member and the torque transmission effect between the shaft assembly and the rotor component, the gap between the sleeve and the shaft hole can be reasonably set. Among them, the gap should not be too small, otherwise the elastic vibration reduction member will be relatively thin and unable to achieve the vibration reduction effect. At the same time, the gap should not be too large, otherwise the shaft assembly and the rotor component cannot be reliably connected, thereby affecting the torque transmission between the shaft assembly and the rotor component. Exemplarily, the gap can be greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0022] For example, a first gap is provided between the shaft sleeve and the shaft hole, and the first gap is evenly provided along the circumference of the shaft hole, so as to ensure that the thickness of the elastic vibration damper is consistent, thereby ensuring that the vibration damping effect of the elastic vibration damper in all directions is relatively balanced. At the same time, this arrangement can also enable the shaft assembly and the rotor component to transmit torque more smoothly.

[0023] In any of the above technical solutions, optionally, the elastic vibration damping member includes: a sleeve portion, which is arranged between the shaft sleeve and the inner wall of the shaft hole; two end cover portions, which are respectively arranged on both sides of the axial arrangement of the sleeve portion and respectively fit with two end surfaces axially arranged of the rotor component, and the end cover portion is connected to the sleeve portion; the sleeve portion and the two end cover portions are an integrated structure.

[0024] In this technical solution, the shaft assembly and the rotor component can be reliably connected through the sleeve portion. The end cover portion is used to limit the two end surfaces of the rotor component, thereby increasing the contact area between the elastic vibration damper and the rotor component, thereby ensuring the connection strength between the rotor component and the elastic vibration damper and preventing the elastic vibration damper from falling off.

[0025] In any of the above technical solutions, optionally, the rotor core includes: a plurality of segmented cores, the plurality of segmented cores are arranged at intervals along a circumferential direction, and the plurality of segmented cores form a plurality of mounting grooves, and the plurality of magnetic tiles are installed in the plurality of mounting grooves; and a plastic fixing member for fixing the plurality of segmented cores and the plurality of magnetic tiles.

[0026] In this technical solution, the rotor core includes a plurality of segmented cores and a plastic fixing for assembling the plurality of segmented cores and the plurality of magnetic tiles into a whole. In this way, since the main frame of the rotor core is set as a plastic fixing, the plurality of segmented cores and the plurality of magnetic tiles can be installed more compactly, thereby reducing the volume of the entire rotor component. In addition, this arrangement can also make the fixed connection between the plurality of segmented cores and the plurality of magnetic tiles more reliable, avoiding the phenomenon of the segmented cores and the magnetic tiles becoming loose. In addition, compared with the entire core, the segmented core can improve the overall performance of the motor.

[0027] Exemplarily, the segmented iron core includes a plurality of segmented iron core sheets stacked in layers, and the plurality of segmented iron core sheets are riveted together by rivets.

[0028] The shaft sleeve and the plastic fixing part need to transmit power, so the shaft sleeve and the plastic fixing part can be made of a material with a higher hardness. Generally speaking, the hardness of the elastic vibration damping part is less than the hardness of the shaft sleeve and the plastic fixing part. Exemplarily, the shaft sleeve and the plastic fixing part are made of the same material.

[0029] In another specific solution, the rotor component is a surface-mounted rotor component, that is, a structure in which the magnetic tiles are arranged on the surface of the rotor core.

[0030] In any of the above technical solutions, optionally, the plastic fixing part is a third injection-molded part formed by injection molding with a plurality of segmented iron cores and a plurality of magnetic tiles as injection-molded inserts.

[0031] In this technical solution, the rotor component is an injection molded part. During injection molding, multiple segmented iron cores and multiple magnetic tiles can be placed in a mold as inserts, and then injection molded to form a plastic fixing, so that the multiple segmented iron cores and multiple magnetic tiles can be connected into a whole through the plastic fixing. Among them, by using the multiple segmented iron cores and multiple magnetic tiles as inserts to form a plastic fixing, the multiple segmented iron cores and multiple magnetic tiles can be reliably connected to the plastic fixing, so that the strength of the entire rotor component can be ensured, such as partial parts of the rotor component falling off.

[0032] In any of the above technical solutions, optionally, the plastic fixing part includes: a column, an axial hole is provided on the column, a plurality of segmented iron cores are arranged along the circumference of the column, and one end of the segmented iron core close to the column is connected to the column, and any two adjacent segmented iron cores and the column form a mounting groove; a plurality of abutting portions, the abutting portions are arranged between two adjacent segmented iron cores, and abut against one end of the magnetic tile away from the column, and the plurality of abutting portions abut against the plurality of magnetic tiles in a one-to-one correspondence; a plurality of first connecting portions, located on one side of the plurality of segmented iron cores arranged along the axial direction, and connecting the column and one end face of the plurality of abutting portions, and the plurality of first connecting portions are arranged in a one-to-one correspondence with the plurality of abutting portions; a plurality of second connecting portions, located on the other end face of the plurality of segmented iron cores arranged along the axial direction, and connecting the column and the other end of the plurality of abutting portions, and the plurality of second connecting portions are arranged in a one-to-one correspondence with the plurality of abutting portions.

[0033] In this technical solution, the plastic fixing member includes a column and a first connecting portion and a second connecting portion arranged at both ends of the column, and a plurality of abutting portions arranged between the first connecting portion and the second connecting portion. An axial hole can be formed through the column to accommodate the shaft assembly and the elastic vibration damping member. The plurality of abutting portions can radially limit the plurality of magnetic tiles and connect the plurality of segmented iron cores along the circumferential direction. The first connecting portion and the second connecting portion can limit and fix the axial ends of the segmented iron cores and the magnetic tiles. This type of plastic fixing member can well connect the plurality of segmented iron cores and the plurality of magnetic tiles into a whole, and can ensure the overall strength and compactness of the rotor component.

[0034] In any of the above technical solutions, optionally, a first positioning structure is formed at both ends of each abutment portion along the circumference of the column, a second positioning structure is formed at both ends of the segmented iron core along the circumference of the column, and adjacent segmented iron cores and abutments are connected via the first positioning structure and the second positioning structure.

[0035] In this technical solution, the first positioning structure and the second positioning structure between the abutment part and the segmented iron core can realize the positioning and installation between the abutment part and the segmented iron core, thereby ensuring the connection reliability between the abutment part and the segmented iron core and improving the strength of the entire rotor assembly.

[0036] In any of the above technical solutions, optionally, the first positioning structure is a positioning groove surrounded by the abutment portion and the magnetic tile, and the second positioning structure is a positioning protrusion arranged on one side of the segmented iron core along the circumferential direction.

[0037] In this technical solution, at least one positioning protrusion can be set on both sides of the circumferential arrangement of the segmented iron core, so that the position of the segmented iron core can be more fixed through the positioning of the positioning protrusion and the positioning groove, and the segmented iron core can be fixed more firmly on the plastic fixing part.

[0038] In any of the above technical solutions, optionally, at least one injection hole is provided on the segmented iron core, and the plastic fixing member further includes at least one positioning shaft, and the at least one positioning shaft is installed in the at least one injection hole in a one-to-one correspondence.

[0039] In this technical solution, an injection hole is provided on the segmented iron core, so that when the plastic fixing part is injection-molded, a positioning axis can be formed in the through hole, thereby increasing the contact area between the plastic fixing part and the segmented iron core, making the fixation between the plastic fixing part and the segmented iron core more reliable.

[0040] The technical solution of the second aspect of the present application provides a motor, including the rotor assembly provided by any technical solution of the first aspect.

[0041] Since the motor includes the rotor assembly provided by any one of the technical solutions of the first aspect, the motor has all the beneficial effects of the rotor assembly provided by any one of the technical solutions of the first aspect, which will not be described in detail here.

[0042] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0044] Figure 1One of the structural schematic diagrams of the rotor assembly in the embodiment of the present application is shown;

[0045] Figure 2 A schematic diagram of the exploded structure of a rotor assembly in an embodiment of the present application is shown;

[0046] Figure 3 The second structural schematic diagram of the rotor assembly in the embodiment of the present application is shown;

[0047] Figure 4 The third structural schematic diagram of the rotor assembly in the embodiment of the present application is shown;

[0048] Figure 5 A schematic structural diagram of a rotating shaft assembly of a rotor assembly in an embodiment of the present application is shown;

[0049] Figure 6 A schematic structural diagram of a rotor component of a rotor assembly in an embodiment of the present application is shown;

[0050] Figure 7 One of the structural schematic diagrams of the segmented core of the rotor assembly in the embodiment of the present application is shown;

[0051] Figure 8 The second structural schematic diagram of the segmented core of the rotor assembly in the embodiment of the present application is shown;

[0052] Fig. 9 A schematic flow chart of a method for preparing a rotor assembly in an embodiment of the present application is shown;

[0053] Fig.10 Another schematic flow chart of the method for preparing a rotor assembly in an embodiment of the present application is shown.

[0054] in, Figures 1 to 8 The corresponding relationship between the reference numerals and component names in the figure is:

[0055] 1 rotor component, 12 rotor core, 122 shaft hole, 1222 first protrusion, 1224 second recess, 124 block core, 1242 positioning protrusion, 1244 injection hole, 126 plastic fixing part, 1260 positioning groove, 1262 column, 1264 abutment part, 1266 first connecting part, 1268 second connecting part, 1269 positioning shaft, 14 magnetic tile, 2 shaft assembly, 22 shaft, 24 sleeve, 242 first recess, 244 second protrusion, 3 elastic vibration damping part, 32 sleeve part, 34 end cover part. DETAILED DESCRIPTION

[0056] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0058] Refer to the following Figures 1 to 10 To describe the rotor assembly and the preparation method thereof provided in the embodiments of the present application.

[0059] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the first aspect of the present application provides a rotor assembly, including: a rotor component 1, including a rotor core 12 and a plurality of magnetic tiles 14, the rotor core 12 is provided with an axial hole 122, and the inner wall of the axial hole 122 is provided with one of a first protrusion 1222 and a first recessed portion 242; a shaft assembly 2, including a shaft 22 and a sleeve 24 sleeved on the shaft 22, the sleeve 24 is installed in the axial hole 122 and spaced from the axial hole 122, the outer wall of the sleeve 24 is provided with one of a first protrusion 1222 and a first recessed portion 242, and the first protrusion 1222 is arranged in the first recessed portion 242; an elastic vibration damping member 3, at least partially arranged between the sleeve 24 and the inner wall of the axial hole 122.

[0060] According to the rotor assembly provided in the present application, it includes a rotor component 1, a shaft assembly 2 and an elastic vibration damper 3. Among them, the shaft assembly 2 and the rotor component 1 are in contact through the elastic vibration damper 3. The elastic vibration damper 3 is elastic and can play a role in buffering and vibration reduction, so that part of the vibration on the rotor component 1 can be absorbed by the elastic vibration damper 3, thereby reducing the vibration transmitted from the rotor component 1 to the shaft assembly 2, and reducing the noise when the motor is working. At the same time, in the present application, the torque can be transmitted through the sleeve 24 on the shaft 22 and the rotor core 12 of the rotor component 1, and the volume of the sleeve 24 is relatively small, which can reduce the volume of the entire rotor on the one hand, and also make the shaft assembly 2 can be used on the motor rotor with a smaller rotor center hole size on the other hand. For example, for an IPM rotor, the size of its rotor center hole is small, so it is impossible to install a vibration reduction structure between the shaft 22 and the rotor component 1 while installing the inner core. In the present application, since the existing inner core is replaced by a smaller sleeve 24, there is space for setting a vibration reduction structure between the rotating shaft 22 and the rotor component 1. In this way, the volume of the rotor assembly is not increased while ensuring the vibration reduction effect, thereby ensuring that the volume of the rotor assembly is relatively small. In this way, the rotor can be easily prepared into a smaller IPM (embedded permanent magnet) rotor.

[0061] Among them, a third positioning structure is provided on the rotating shaft 22, and a fourth positioning structure is provided on the sleeve 24. The rotating shaft 22 and the sleeve 24 are positioned and connected by the third positioning structure and the fourth positioning structure. For example, one of a recessed portion and a protruding portion is provided on the rotating shaft 22, and one of a recessed portion and a protruding portion is provided on the inner side wall of the sleeve 24. The rotating shaft 22 and the sleeve 24 are positioned and connected by the recessed portion and the protruding portion.

[0062] In any of the above embodiments, optionally, the shaft sleeve 24 is a first injection-molded part formed on the shaft sleeve 24 by injection molding with the rotating shaft 22 as an injection-molded insert.

[0063] In this embodiment, the rotating shaft 22 can be processed first, and then a molding mold can be set for the sleeve 24. Then, the rotating shaft 22 can be placed in the set mold as an injection molded insert, and then the sleeve 24 can be injection molded on the rotating shaft 22 through an injection molding process. In this way, the injection-molded sleeve 24 and the rotating shaft 22 are an integrated structure, so that the connection strength between the two is relatively high, thereby increasing the force bearing capacity of the sleeve 24 and improving the torque transmission effect of the rotor assembly.

[0064] In any of the above embodiments, optionally, the elastic vibration damping member 3 is a second injection-molded member formed by injection molding the rotating shaft assembly 2 as an injection-molded insert.

[0065] In this embodiment, the rotor assembly is an injection molding assembly, and the rotor assembly is formed by injection molding. When the rotor assembly is specifically formed by injection molding, the shaft assembly 2 can be placed in the mold as an insert, and then the elastic vibration damping member 3 is injection molded between the shaft assembly 2 to finally obtain the rotor assembly formed by injection molding. In this solution, since the rotor assembly is formed by injection molding, the connection between the shaft assembly 2 is more reliable, thereby ensuring the connection strength between the elastic vibration damping member 3 and preventing the elastic vibration damping member 3 from falling off.

[0066] Among them, Figure 4 , Figure 5 and Figure 6 As shown, by arranging the first protrusion 1222 and the first recess 242 in the shaft sleeve 24 and the shaft hole 122, the connection between the two can be made more reliable, thereby ensuring the torque transmission effect between the shaft sleeve 24 and the rotor component 1, thereby ensuring the strength of the entire rotor assembly.

[0067] The elastic damper 3 has a certain elasticity and can be made of a relatively soft material such as rubber. The shaft sleeve 24 needs to transmit power and can be made of a material with a relatively high hardness. That is, the hardness of the elastic damper 3 is less than that of the shaft sleeve 24.

[0068] In any of the above embodiments, optionally, one of the key and the keyway is provided on the outer wall of the shaft 22, and the other of the key and the keyway is provided on the inner wall of the sleeve 24, and the shaft 22 and the sleeve 24 are driven and connected by the key and the keyway.

[0069] In this embodiment, the rotating shaft 22 and the shaft sleeve 24 are connected by a key, which can ensure the connection strength between the rotating shaft 22 and the shaft sleeve 24 and ensure the torque transmission effect between the rotating shaft 22 and the shaft sleeve 24.

[0070] In any of the above embodiments, optionally, Figure 4 , Figure 5 and Figure 6 As shown, a plurality of first protrusions 1222 and a plurality of second recesses 1224 are provided on the inner wall of the shaft hole 122, and the plurality of first protrusions 1222 and the plurality of second recesses 1224 are alternately provided; a plurality of first recesses 242 and a plurality of second protrusions 244 are provided on the outer wall of the shaft sleeve 24, and the plurality of first recesses 242 and the plurality of second protrusions 244 are alternately provided; the second protrusions 244 are provided in the second recesses 1224.

[0071] In this embodiment, a plurality of first protrusions 1222 are provided on the shaft hole 122, and a plurality of second protrusions 244 are also provided on the shaft sleeve 24. During installation, the first protrusions 1222 and the second protrusions 244 can be installed in a staggered manner, so that the first protrusion 1222 can correspond to the first recessed portion 242 formed by two adjacent second protrusions 244, and at the same time, the second protrusion 244 can correspond to the second recessed portion 1224 formed by two adjacent first protrusions 1222. In this way, the torque transmission effect between the shaft sleeve 24 and the shaft hole 122 can be ensured by the concave-convex structure on the shaft sleeve 24 and the shaft hole 122, thereby improving the strength of the entire rotor assembly.

[0072] In any of the above embodiments, optionally, Figure 4 As shown, a first gap is provided between the shaft sleeve 24 and the shaft hole 122 , and a width of the first gap along the radial direction of the shaft hole 122 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0073] In order to ensure the vibration reduction effect of the elastic vibration reduction member 3 and the torque transmission effect between the shaft assembly 2 and the rotor component 1, the gap between the sleeve 24 and the shaft hole 122 can be reasonably set. Among them, the gap should not be too small, otherwise the elastic vibration reduction member 3 will be relatively thin and unable to achieve the vibration reduction effect. At the same time, the gap should not be too large, otherwise the shaft assembly 2 and the rotor component 1 cannot be reliably connected, thereby affecting the torque transmission between the shaft assembly 2 and the rotor component 1. Exemplarily, the gap can be greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0074] For example, the gap between the shaft sleeve 24 and the inner wall of the shaft hole 122 is evenly arranged along the circumference of the shaft hole 122, so as to ensure that the thickness of the elastic vibration damper 3 is consistent, thereby ensuring that the vibration damping effect of the elastic vibration damper 3 in all directions is relatively balanced. At the same time, this arrangement can also enable the shaft assembly 2 and the rotor component 1 to transmit torque more smoothly.

[0075] In any of the above embodiments, optionally, Figure 2 and Figure 3 As shown, the elastic vibration damper 3 includes: a sleeve portion 32, which is arranged between the shaft sleeve 24 and the inner wall of the shaft hole 122; two end cover portions 34, which are respectively arranged on both sides of the axial arrangement of the sleeve portion 32, and are respectively fitted with two end surfaces axially arranged on the rotor component 1, and the end cover portions 34 are connected to the sleeve portion 32; the sleeve portion 32 and the two end cover portions 34 are an integrated structure.

[0076] In this embodiment, the shaft assembly 2 and the rotor component 1 can be reliably connected through the sleeve portion 32. The end cover portion 34 is used to limit the two end surfaces of the rotor component 1, so as to increase the contact area between the elastic vibration damper 3 and the rotor component 1, thereby ensuring the connection strength between the rotor component 1 and the elastic vibration damper 3 and preventing the elastic vibration damper 3 from falling off.

[0077] In any of the above embodiments, optionally, Figure 2 and Figure 4 As shown, the rotor core 12 includes: a plurality of segmented cores 124 , the plurality of segmented cores 124 are spaced apart along a circumferential direction, and the plurality of segmented cores 124 form a plurality of mounting grooves, and a plurality of magnetic tiles 14 are mounted in the plurality of mounting grooves; a plastic fixing member 126 , used to fix the plurality of segmented cores 124 and the plurality of magnetic tiles 14 .

[0078] In this embodiment, the rotor core 12 includes a plurality of segmented cores 124 and a plastic fixing 126 for assembling the plurality of segmented cores 124 and the plurality of magnetic tiles 14 into a whole. In this way, since the main frame of the rotor core 12 is set as the plastic fixing 126, the plurality of segmented cores 124 and the plurality of magnetic tiles 14 can be installed more compactly, thereby reducing the volume of the entire rotor component 1. In addition, this arrangement can also make the fixed connection between the plurality of segmented cores 124 and the plurality of magnetic tiles 14 more reliable, avoiding the phenomenon that the segmented cores 124 and the magnetic tiles 14 become loose. In addition, compared with the entire core, the segmented core 124 can improve the overall performance of the motor.

[0079] For example, Figure 8 As shown, the segmented iron core 124 includes a plurality of segmented iron core sheets stacked in layers, and the plurality of segmented iron core sheets are riveted together by rivets.

[0080] The shaft sleeve 24 and the plastic fixing member 126 need to transmit power, so the shaft sleeve 24 and the plastic fixing member 126 can be made of a material with a higher hardness. Generally speaking, the hardness of the elastic vibration damper 3 is less than the hardness of the shaft sleeve 24 and the plastic fixing member 126. Exemplarily, the shaft sleeve 24 and the plastic fixing member 126 are made of the same material.

[0081] In any of the above embodiments, optionally, the plastic fixing member 126 is a third injection-molded part formed by injection molding using a plurality of segmented iron cores 124 and a plurality of magnetic tiles 14 as injection-molded inserts.

[0082] In this embodiment, the rotor component 1 is an injection molded part. During injection molding, multiple segmented iron cores 124 and multiple magnetic tiles 14 can be placed in a mold as inserts, and then injection molded to form a plastic fixing 126, so that the multiple segmented iron cores 124 and multiple magnetic tiles 14 can be connected into a whole through the plastic fixing 126. Among them, by using the multiple segmented iron cores 124 and multiple magnetic tiles 14 as inserts to form a plastic fixing 126, the multiple segmented iron cores 124 and multiple magnetic tiles 14 can be reliably connected to the plastic fixing 126, so that the strength of the entire rotor component 1 can be ensured, such as partial parts of the rotor component 1 falling off.

[0083] In any of the above embodiments, optionally, Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the plastic fixing member 126 includes: a column 1262, the column 1262 is provided with an axial hole 122, a plurality of segmented iron cores 124 are arranged along the circumference of the column 1262, and one end of the segmented iron core 124 close to the column 1262 is connected to the column 1262, and any two adjacent segmented iron cores 124 and the column 1262 form a mounting groove; a plurality of abutment portions 1264, the abutment portions 1264 are arranged between two adjacent segmented iron cores 124, and abut against one end of the magnetic tile 14 away from the column 1262, and the plurality of abutment portions 1264 and the plurality of The magnetic tiles 14 are abutted one by one; a plurality of first connection parts 1266 are located on one side of the plurality of segmented iron cores 124 arranged along the axial direction, and connect the column 1262 and one end surface of the plurality of abutting parts 1264, and the plurality of first connection parts 1266 are arranged one by one with the plurality of abutting parts 1264; a plurality of second connection parts 1268 are located on the other end surface of the plurality of segmented iron cores 124 arranged along the axial direction, and connect the column 1262 and the other end of the plurality of abutting parts 1264, and the plurality of second connection parts 1268 are arranged one by one with the plurality of abutting parts 1264.

[0084] In this embodiment, the plastic fixing member 126 includes a column 1262 and a first connecting portion 1266 and a second connecting portion 1268 disposed at both ends of the column 1262, and a plurality of abutting portions 1264 disposed between the first connecting portion 1266 and the second connecting portion 1268. The column 1262 can form an axial hole 122 to accommodate the shaft assembly 2 and the elastic vibration damping member 3. The plurality of abutting portions 1264 can radially limit the plurality of magnetic tiles 14 and enable the plurality of segmented cores 124 to be connected in the circumferential direction. The first connecting portion 1266 and the second connecting portion 1268 can limit and fix the axial ends of the segmented cores 124 and the magnetic tiles 14. This type of plastic fixing member 126 can well connect the plurality of segmented cores 124 and the plurality of magnetic tiles 14 into a whole, and can ensure the overall strength and compactness of the rotor component 1.

[0085] In any of the above embodiments, optionally, Figure 4 As shown, each abutment portion 1264 has a first positioning structure formed at both ends of the column 1262 circumferentially arranged, and a second positioning structure is formed at both ends of the segmented iron core 124 circumferentially arranged on the column 1262, and adjacent segmented iron cores 124 and abutments 1264 are connected by the first positioning structure and the second positioning structure.

[0086] In this embodiment, the first positioning structure and the second positioning structure between the abutment portion 1264 and the segmented iron core 124 can realize the positioning and installation between the abutment portion 1264 and the segmented iron core 124, thereby ensuring the connection reliability between the abutment portion 1264 and the segmented iron core 124 and improving the strength of the entire rotor assembly.

[0087] In any of the above embodiments, optionally, Figure 4 As shown, the first positioning structure is a positioning groove 1260 formed by the abutment portion 1264 and the magnetic tile 14. Figure 7 and Figure 8 As shown, the second positioning structure is a positioning protrusion 1242 arranged on one side of the segmented core 124 along the circumferential direction.

[0088] In this embodiment, at least one positioning protrusion 1242 can be set on both sides of the circumferential arrangement of the segmented iron core 124, so that the position of the segmented iron core 124 can be more fixed through the positioning of the positioning protrusion 1242 and the positioning groove 1260, and the segmented iron core 124 can be fixed more securely on the plastic fixing part 126.

[0089] In any of the above embodiments, optionally, Figure 7 and Figure 8 As shown, at least one injection hole 1244 is provided on the segmented core 124. Figure 4 As shown, the plastic fixing member 126 further includes at least one positioning shaft 1269 , and the at least one positioning shaft 1269 is installed in the at least one injection hole 1244 in a one-to-one correspondence.

[0090] In this embodiment, an injection hole 1244 is provided on the segmented iron core 124, so that when the plastic fixing part 126 is injection-molded, a positioning shaft 1269 can be formed in the through hole, thereby increasing the contact area between the plastic fixing part 126 and the segmented iron core 124, making the fixation between the plastic fixing part 126 and the segmented iron core 124 more reliable.

[0091] In another specific embodiment, the rotor component is a surface mounted rotor component, that is, a structure in which the magnetic tiles are arranged on the surface of the rotor core.

[0092] like Figures 1 to 8As shown, this embodiment relates to a motor vibration reduction rotor structure, which includes an outer iron core and magnetic tiles 14, a shaft assembly 2 and vibration reduction material. The outer iron core and magnetic tiles 14 are wrapped with an outer plastic (equivalent to the plastic fixing part 126) to form a whole, and a through hole (equivalent to the shaft hole 122) is formed in the center. The outer iron core is composed of 10 independent block iron cores 124. Grooves for accommodating magnetic tiles 14 are formed between two block iron cores 124 and are distributed radially. There are bosses protruding inward on the side walls of the through hole; the shaft 22 is formed with a circle of inner plastic (equivalent to the shaft sleeve 24) on the outside of the shaft 22 by injection molding. The shaft 2 2 and the plastic structure fixed on the rotating shaft 22 constitute the rotating shaft assembly 2, the inner plastic and the rotating shaft 22 are fixed in the axial and circumferential directions by the splines and grooves on the rotating shaft 22, the rotating shaft 22 and the inner plastic are placed in the central through hole of the outer plastic, the inner plastic has a boss protruding outward and cooperates with the boss of the central through hole to form a gap, the vibration damping member is filled in the gap formed by the outer plastic, the rotating shaft 22 and the inner plastic, and covers the axial end faces on both sides of the rotor to ensure the vibration reduction effect of the rotor.

[0093] The rotating shaft 22 is provided with splines and grooves, and the plastic structure cooperates with the splines and grooves to achieve circumferential and circumferential fixation with the rotating shaft 22 .

[0094] The plastic structure on the rotating shaft 22 has a boss protruding outwards, and the boss protruding inwards of the central through hole of the outer core and the boss protruding outwards of the plastic structure are staggered to form a uniform gap in the circumferential direction, and the gap width is greater than or equal to 0.5 mm.

[0095] The present embodiment discloses a motor vibration reduction rotor structure, which consists of three parts. The first part is the rotor outer core and magnetic tiles 14. The magnetic tiles 14 are placed radially in the grooves between the outer cores, and the outer core and the magnetic tiles 14 are wrapped with plastic material to form a whole; the second part is the shaft assembly 2, which includes a shaft 22 and a plastic structure fixed on the shaft. The plastic structure is combined with the shaft by injection molding, and a boss is designed on the outside. The inside is axially and circumferentially fixed by splines and grooves on the shaft; the third part is the vibration reduction material, which fills the gap between the outer core and the shaft 22 and the plastic structure, and covers the axial end faces on both sides of the rotor.

[0096] An embodiment of the second aspect of the present application provides a motor (not shown in the figure), comprising a rotor assembly provided by any embodiment of the first aspect.

[0097] Since the motor includes the rotor assembly provided by any one of the embodiments of the first aspect, the motor has all the beneficial effects of the rotor assembly provided by any one of the embodiments of the first aspect, which will not be described in detail here.

[0098] The third aspect of the present application provides a method for preparing a rotor assembly, which is used to prepare the rotor assembly provided by any one of the embodiments of the first aspect. Fig. 9 As shown, the preparation method comprises:

[0099] S902, using the rotating shaft as an injection molded insert, injection mold a sleeve on the rotating shaft to obtain a rotating shaft assembly;

[0100] S904, assembling the rotor component, the elastic vibration damping component and the shaft assembly into a rotor assembly.

[0101] According to the preparation method of the rotor assembly provided by the present application, the shaft can be processed first, and then a molding mold can be set for the sleeve. Then, the shaft can be placed in the set mold as an injection molded insert, and then the sleeve can be injection molded on the shaft through an injection molding process. In this way, the injection molded sleeve and the shaft are an integrated structure, so that the connection strength between the two is relatively high, thereby increasing the force bearing capacity of the sleeve and improving the torque transmission effect of the rotor assembly.

[0102] Further, S904 specifically includes: forming an elastic vibration damping part by injection molding with the rotor component and the shaft assembly as an injection molded insert to obtain a rotor assembly.

[0103] In this embodiment, the rotor assembly is an injection molding assembly, and the rotor assembly is formed by injection molding. When the rotor assembly is specifically formed by injection molding, the rotor component and the shaft assembly can be placed in the mold as inserts, and then an elastic vibration damping member is formed by injection molding between the rotor component and the shaft assembly, and finally the rotor assembly formed by injection molding is obtained. In this solution, since the rotor assembly is formed by injection molding, the connection between the rotor component and the shaft assembly is more reliable, thereby ensuring the connection strength between the rotor component and the elastic vibration damping member 3 and preventing the elastic vibration damping member from falling off.

[0104] In any of the above embodiments, optionally, the rotor core includes a plurality of segmented cores. Fig.10 As shown, the preparation method comprises:

[0105] S1002, using the plurality of segmented iron cores and the plurality of magnetic tiles as injection molded inserts to form a plastic fixing member, thereby obtaining a rotor component, wherein the plurality of segmented iron cores surround a plurality of mounting grooves, the plurality of magnetic tiles are mounted in the plurality of mounting grooves, and the plastic fixing member is used to assemble the plurality of segmented iron cores and the plurality of magnetic tiles into one body;

[0106] S1004, using the rotating shaft as an injection molded insert, injection mold a shaft sleeve on the rotating shaft to obtain a rotating shaft assembly;

[0107] S1006, forming an elastic vibration damping part by injection molding with the rotor component and the rotating shaft assembly as an injection molded insert to obtain a rotor assembly.

[0108] In this embodiment, the rotor core includes a plurality of segmented cores and a plastic fixing for assembling the plurality of segmented cores and the plurality of magnetic tiles into a whole. In this way, since the main frame of the rotor core is set as a plastic fixing, the plurality of segmented cores and the plurality of magnetic tiles can be installed more compactly, thereby reducing the volume of the entire rotor component. In addition, this arrangement can also make the fixed connection between the plurality of segmented cores and the plurality of magnetic tiles more reliable, avoiding the phenomenon of the segmented cores and the magnetic tiles becoming loose. In addition, compared with the entire core, the segmented core can improve the overall performance of the motor.

[0109] At the same time, in this solution, the rotor component is an injection molded part. During injection molding, multiple segmented iron cores and multiple magnetic tiles can be placed in a mold as inserts, and then injection molded to form a plastic fixing, so that the multiple segmented iron cores and multiple magnetic tiles can be connected into a whole through the plastic fixing. Among them, by using the multiple segmented iron cores and multiple magnetic tiles as inserts to form a plastic fixing, the multiple segmented iron cores and multiple magnetic tiles can be reliably connected to the plastic fixing, so that the strength of the entire rotor component can be ensured, such as partial parts of the rotor component falling off.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: include: The rotor component comprises a rotor core and a plurality of magnetic tiles, wherein the rotor core is provided with an axial hole, and an inner wall of the axial hole is provided with one of a first protrusion and a first recess; A rotating shaft assembly, comprising a rotating shaft and a shaft sleeve sleeved on the rotating shaft, wherein the shaft sleeve is installed in the shaft hole and spaced apart from the shaft hole, wherein the outer wall of the shaft sleeve is provided with one of the first protrusion and the first recess, and the first protrusion is provided in the first recess; The elastic vibration damping member is at least partially arranged between the shaft sleeve and the inner wall of the shaft hole.

2. The rotor assembly according to claim 1, characterized in that The shaft sleeve is a first injection-molded part formed on the shaft sleeve by injection molding with the rotating shaft as an injection-molded insert.

3. The rotor assembly according to claim 1, characterized in that: The elastic vibration damping component is a second injection molded component formed by injection molding with the rotor component and the rotating shaft assembly as an injection molded insert.

4. The rotor assembly according to claim 1, characterized in that: One of a key and a keyway is arranged on the outer side wall of the rotating shaft, the other of the key and the keyway is arranged on the inner side wall of the shaft sleeve, and the rotating shaft and the shaft sleeve are drivingly connected via the key and the keyway.

5. The rotor assembly according to claim 1, characterized in that: A plurality of the first protrusions and a plurality of the second recesses are arranged on the inner wall of the shaft hole, and the plurality of the first protrusions and the plurality of the second recesses are arranged alternately; The outer wall of the sleeve is provided with a plurality of the first recessed portions and a plurality of the second raised portions, and the plurality of the first recessed portions and the plurality of the second raised portions are alternately arranged; The second protrusion is disposed in the second recess.

6. The rotor assembly according to claim 1, characterized in that A first gap is provided between the shaft sleeve and the shaft hole; The width of the first gap along the radial direction of the axial hole is greater than or equal to 0.5 mm and less than or equal to 5 mm; and / or The first gaps are evenly arranged along the circumference of the shaft hole.

7. The rotor assembly according to claim 1, characterized in that The elastic vibration damping member comprises: A sleeve portion, disposed between the shaft sleeve and the inner wall of the shaft hole; Two end cover parts are respectively arranged on two sides of the sleeve part axially arranged, and are respectively fitted with two end surfaces of the rotor part axially arranged, and the end cover parts are connected to the sleeve part; The sleeve portion and the two end cover portions are an integrated structure.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: The rotor core comprises: A plurality of segmented iron cores, wherein the segmented iron cores are arranged at intervals along a circumferential direction, the segmented iron cores form a plurality of mounting grooves, and the magnetic tiles are mounted in the plurality of mounting grooves; The plastic fixing piece is used to fix the plurality of segmented iron cores and the plurality of magnetic tiles.

9. The rotor assembly according to claim 8, characterized in that The plastic fixing part is a third injection-molded part formed by injection molding a plurality of the segmented iron cores and a plurality of the magnetic tiles as injection-molded inserts.

10. The rotor assembly according to claim 8, characterized in that The plastic fixing member comprises: A column, wherein the axial hole is arranged on the column, a plurality of the segmented iron cores are arranged along the circumference of the column, and one end of the segmented iron core close to the column is connected to the column, and any two adjacent segmented iron cores and the column form a mounting groove; A plurality of abutment portions, wherein the abutment portions are arranged between two adjacent segmented cores and abut against an end of the magnetic tile away from the column, and the plurality of abutment portions abut against the plurality of magnetic tiles in a one-to-one corresponding manner; A plurality of first connecting portions, located on one side of the plurality of segmented cores arranged along the axial direction, and connecting the column and one end surface of the plurality of abutting portions, and the plurality of first connecting portions and the plurality of abutting portions are arranged one-to-one correspondingly; A plurality of second connection parts are located on the other end surface of the plurality of segmented cores arranged along the axial direction, and connect the column and the other end of the plurality of abutment parts, and the plurality of second connection parts are arranged one by one with the plurality of abutment parts.

11. The rotor assembly according to claim 10, characterized in that Each of the abutment portions is provided with a first positioning structure at both ends along the circumference of the column, and the segmented iron core is provided with a second positioning structure at both ends along the circumference of the column. Adjacent segmented iron cores and abutment portions are connected via the first positioning structure and the second positioning structure.

12. The rotor assembly according to claim 11, characterized in that The first positioning structure is a positioning groove surrounded by the abutting portion and the magnetic tile, and the second positioning structure is a positioning protrusion arranged on one side of the segmented iron core along the circumferential direction.

13. The rotor assembly according to claim 8, characterized in that At least one injection hole is arranged on the segmented iron core, and the plastic fixing member further comprises at least one positioning shaft, and the at least one positioning shaft is installed in at least one of the injection holes in a one-to-one correspondence.

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

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