Rotor assembly and motor

Abstract

The utility model belongs to the technical field of motor equipment, and particularly relates to a rotor assembly and a motor. The rotor assembly comprises a rotating shaft, the rotating shaft is provided with an assembling part, the end, away from the assembling part, of the rotating shaft is a shaft extension end, the position, close to the shaft extension end, of the side wall of the rotating shaft is provided with an end portion flat position structure, the assembling part is provided with a groove structure, and at least part of the groove structure is located on the other side, opposite to the end portion flat position structure, of the rotating shaft; the injection molding part is sleeved on the rotating shaft in an injection molding manner and wraps the periphery of the assembling part; wherein part of the injection molding part extends into the groove structure, and the whole rotor assembly is in a dynamic balance state. According to the utility model, the groove structure on the rotating shaft is matched and connected with the injection molding part, so that the non-uniform weight caused by an end part flat position structure can be made up, the whole rotor assembly achieves dynamic balance, additional arrangement of a balancing weight and dynamic balance correction are not needed, the structure and the processing flow are simplified, the lightweight structural design is convenient to realize, and the production cost is reduced. And the production efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor equipment, and in particular relates to a rotor assembly and a motor. Background Art

[0002] In common motors, since a flattened structure is usually provided at the shaft extension end of the rotor shaft, the weight of the shaft extension end close to the flattened structure is relatively light, while the weight of the non-shaft extension end on the same side is relatively heavy, resulting in uneven weight of the rotor, causing the rotor to be dynamically unbalanced, large vibration and noise generated when the motor is working, poor stability during power output, and fatigue wear of the shaft during long-term use, resulting in a shortened service life. In order to compensate for the above defects, the prior art generally adopts the method of adding counterweights to the rotor for dynamic balancing correction so that the rotor reaches a dynamic balance state. However, the above method requires the installation of additional structures, which increases the overall weight of the rotor, is not conducive to the lightweight design of the motor, and also requires dynamic balancing correction operations, which makes the processing and manufacturing process more complicated and affects production efficiency. Utility Model Content

[0003] In view of this, in order to improve at least one of the above problems existing in the prior art, the utility model provides a rotor assembly and a motor.

[0004] The technical solution of the first aspect of the utility model provides a rotor assembly, including: a rotating shaft, the rotating shaft is provided with an assembly portion, and the end of the rotating shaft away from the assembly portion is a shaft extension end, an end flattened structure is provided on the side wall of the rotating shaft near the shaft extension end, the assembly portion is provided with a groove structure, and at least part of the groove structure is located on the other side of the rotating shaft opposite to the end flattened structure; an injection molded part, which is sleeved on the rotating shaft and circumferentially covers the assembly portion; wherein part of the injection molded part extends into the groove structure and puts the rotor assembly as a whole in a dynamically balanced state.

[0005] In a feasible implementation, the groove structure includes a first groove, which is located on the other side of the rotating shaft opposite to the end flat structure and is recessed inward along the lateral direction of the rotating shaft; the injection molded part is an annular structure, and a first protrusion is provided on the inner wall surface of the injection molded part at a position opposite to the first groove, and the first protrusion extends into the first groove and is connected to the inner wall surface of the first groove.

[0006] In a feasible implementation, the first groove is a flat groove structure.

[0007] In a feasible implementation, a knurled surface is provided on the circumferential side of the assembly portion; the groove structure also includes at least one second groove, the second groove is provided on the knurled surface, and extends along the circumference of the rotating shaft; a second protrusion adapted to the second groove is also provided on the inner wall surface of the injection molded part, the second protrusion extends into the second groove, and is connected to the inner wall surface of the second groove.

[0008] In a feasible implementation, the second groove is a spiral groove structure or an annular groove structure.

[0009] In a feasible implementation, the first groove is located on the other side of the knurled surface opposite to the end flattened structure, and at least a portion of the second groove passes through the first groove in the circumferential direction.

[0010] In a feasible implementation, in the axial direction, the first groove is located on a side of the knurled surface close to the end flattened structure, and a first distance exists between the first groove and an end edge of the knurled surface close to the end flattened structure.

[0011] In a feasible implementation, the sum of the axial dimension of the first groove and the first spacing is less than or equal to half of the axial dimension of the knurled surface.

[0012] In a possible implementation, the injection molded part is made of a mixture of glass fiber and any one of nylon 6, nylon 66 or PBT polyester.

[0013] In an embodiment of the second aspect of the present invention, a motor is provided, comprising the rotor assembly of any one of the above-mentioned first aspect.

[0014] The beneficial effects of the above technical solution of the utility model are embodied in:

[0015] Improved connection between the rotor shaft and the injection molded part structure can compensate for the uneven weight caused by the flat end structure, so that the rotor assembly as a whole can achieve dynamic balance without the need for additional counterweights or dynamic balance correction. This simplifies the existing rotor structure, facilitates lightweight structural design, and simplifies the processing and manufacturing process, which is beneficial to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure shows a side partial cross-sectional view of a rotor assembly provided by one embodiment of the utility model.

[0017] Figure 2 Shown is a three-dimensional schematic diagram of a rotating shaft provided by an embodiment of the utility model.

[0018] Figure 3 Shown is a schematic diagram of a rotating shaft provided by an embodiment of the utility model.

[0019] Figure 4 The figure shows a partial cross-sectional view of the shaft of a rotor assembly provided by one embodiment of the utility model.

[0020] Figure 5 Shown is a side partial cross-sectional view of another rotor assembly provided by an embodiment of the utility model.

[0021] Figure 6 Shown is a partial side schematic diagram of another rotating shaft provided by an embodiment of the utility model.

[0022] Figure 7 Shown is a side partial cross-sectional view of a rotor assembly provided by one embodiment of the utility model.

[0023] Figure 8 Shown is a schematic exploded view of a rotor assembly provided by an embodiment of the utility model.

[0024] Fig. 9 Shown is a schematic block diagram of a motor provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0025] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0026] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Application Overview

[0029] In recent years, with the advancement and development of motor technology, the requirements for motors have become increasingly higher. In some common motors, in order to facilitate the assembly of the motor, a flattened structure is usually set at the shaft extension end of the rotor shaft. The shaft extension end close to the flattened side is relatively light, while the weight of the non-shaft extension end on the same side is relatively heavy, resulting in uneven weight of the rotor as a whole, causing the rotor to be dynamically unbalanced. When the motor is working, the vibration and noise generated during the rotation of the rotor are large, which is not conducive to the stability of the power output process. It will also cause fatigue wear of the shaft during long-term use, resulting in a shortened service life.

[0030] To this end, the prior art provides some measures to compensate for the above defects, such as adding a counterweight to the rotor to perform dynamic balancing correction so that the rotor reaches a dynamic balance state. However, the above method requires the installation of additional structures, which increases the overall weight of the rotor, is not conducive to the lightweight design of the motor, and also requires dynamic balancing correction operations, which makes the processing and manufacturing process more complicated and affects production efficiency.

[0031] Some embodiments of the rotor assembly and the motor in the technical solution of the utility model are provided below.

[0032] In one embodiment of the first aspect of the present invention, a rotor assembly 100 is provided, such as Figure 1 and Figure 2 As shown, the rotor assembly 100 includes a rotating shaft 1 and an injection molded part 2. The rotating shaft 1 is provided with an assembly portion 10 for connecting the injection molded part 2, and the injection molded part 2 is sleeved on the rotating shaft 1 and circumferentially covered on the assembly portion 10; the end of the rotating shaft 1 away from the assembly portion 10 is a shaft extension end 12, and a position close to the shaft extension end 12 on the side wall of the rotating shaft 1 is provided with an end flattened structure 121, and correspondingly, the assembly portion 10 of the rotating shaft 1 is provided with a groove structure, at least part of the groove structure is located on the other side of the rotating shaft 1 opposite to the end flattened structure 121, and part of the injection molded part 2 extends into the groove structure, so that the rotor assembly 100 is in a dynamic balance state as a whole.

[0033] It can be understood that in order to facilitate the connection and assembly with the driven mechanism, the motor usually has a flat structure on the shaft 1 at the shaft extension end 12, for example Figure 1 and Figure 2 The end flattened structure 121 shown in the figure is essentially a structure in which a part of the side of the cylindrical shaft 1 is cut off to make the surface flat. During assembly, a corresponding structure is set at a corresponding position on the driven mechanism to achieve the snap-fitting of the two, thereby outputting torque. However, due to the existence of the flattened structure, an irregular structure may appear in a local area of ​​the shaft 1, resulting in uneven weight, so that the rotor assembly 100 as a whole is in a dynamically unbalanced state.

[0034] The rotor assembly 100 in this embodiment improves the structure and connection method of the rotating shaft 1 and the injection molded part 2, and utilizes the groove structure on the rotating shaft 1 to cooperate with the injection molded part 2 to compensate for the uneven weight caused by the end flat structure 121, so that the rotor assembly 100 as a whole can achieve dynamic balance. There is no need to set up additional counterweights or perform dynamic balancing correction, which simplifies the existing rotor structure, facilitates the realization of lightweight structural design, and also simplifies the processing and manufacturing process, which is conducive to improving production efficiency.

[0035] According to experimental data, the dynamic unbalance of the rotor assembly in this embodiment can be controlled within 500 mg, which has reached the required range of the dynamic balance state.

[0036] It should be noted that, in actual use, the injection molded part 2 can be directly injection molded on the assembly part 10 of the rotating shaft 1, using the groove structure of the rotating shaft 1 as a template to directly form a structure that cooperates with the groove structure. Among them, the shape, size and other parameters of the groove structure can be calculated in advance based on the end flat structure 121, the material parameters of the injection plastic and the specific structural form of the injection molded part 2, and then the rotating shaft 1 is processed, and then the injection molding operation of the injection molded part 2 is performed. After the injection molding is completed, the rotating shaft 1 and the injection molded part 2 are connected and fixed, and the whole can be in a dynamic balance state without the need for correction processing.

[0037] In addition, the groove structure in this embodiment is not limited to Figure 1 The one shown in the figure may also be provided with a plurality of groove structures according to specific use needs, and the specific situation is similar to that of the present embodiment; the shape of the groove structure is not limited to Figure 1 and Figure 2 The long strip structure shown in the figure may also adopt grooves of other structures, which will not be described in detail here.

[0038] In a further embodiment of the present invention, Figures 1 to 3 As shown, the groove structure of the rotating shaft 1 specifically includes a first groove 111. The first groove 111 is located on the other side of the rotating shaft 1 opposite to the end flat structure 121, and is grooved inward along the lateral direction of the rotating shaft 1, so as to make up for the missing part of the weight of the end flat structure 121 by using the cavity of the first groove 111. Correspondingly, the injection molded part 2 is an annular structure, which is sleeved on the assembly part 10 of the rotating shaft 1. A first protrusion 21 is provided on the inner wall surface of the injection molded part 2 at a position opposite to the first groove 111. The first protrusion 21 extends into the first groove 111 and is connected and fixed to the inner wall surface of the first groove 111. By calculating the structural shape and the injection molded material in advance, the weight loss of the assembly part 10 caused by the first groove 111 and the first protrusion 21 can be adapted to the weight loss of the end flat structure 121, so as to achieve mutual compensation, and then the rotor assembly 100 is formed into a dynamic balance state as a whole.

[0039] Preferably, the first groove 111 and the end flattened structure 121 are 180 degrees apart in the circumferential direction. Figure 1 In the example in FIG. 1 , the bottom surface of the first groove 111 is arranged parallel to the plane of the end flattened structure 121 .

[0040] Furthermore, if Figures 1 to 4 In the example, the first groove 111 specifically adopts a flat groove structure, that is, only two side walls of the first groove 111 in the axial direction are retained, and it is in a through state in the lateral direction. The structure is simpler, can be easily processed, and is conducive to injection molding operation.

[0041] In a further embodiment of the present invention, Figure 5 As shown, a knurled surface 101 is provided on the circumferential side surface of the assembly portion 10 of the rotating shaft 1, which can increase the contact area with the injection molded part 2 during injection molding. The groove structure also includes at least one second groove 112. Specifically, a second groove 112 is provided on the knurled surface 101, and the second groove 112 extends along the circumference of the rotating shaft 1. Correspondingly, a second protrusion 22 is provided on the inner wall surface of the injection molded part 2. The second protrusion 22 is adapted to the second groove 112, extends into the second groove 112, and is connected to the inner wall surface of the second groove 112. Similar to the first protrusion 21, the second protrusion 22 can also be directly formed by injection molding so that the second protrusion 22 extends into the second groove 112. After the injection molding is completed, the second protrusion 22 is naturally melted and connected to the inner wall surface of the second groove 112.

[0042] In this embodiment, by adding a knurled surface 101 and a second groove 112 to the assembly portion 10 of the shaft 1, the second groove 112 and the second protrusion 22 can be directly matched with each other, and the direct connection strength between the shaft 1 and the injection molded part 2 in the circumferential direction of the shaft 1 can be further improved.

[0043] Among them, since the weight loss of the end flattened structure 121 is a fixed value, the structure and material of the first groove 111, the second groove 112 and the first protrusion 21, the second protrusion 22 need to be considered in advance calculation, so that the overall weight loss is compatible with the weight loss of the end flattened structure 121, so as to achieve an overall dynamic balance state. Therefore, by adding the second groove 112 and the second protrusion 22, the size of the first groove 111 can be reduced, for example, the length of the first groove 111 is shortened in the axial direction, so that the first groove 111 is closer to the end flattened structure 121 as a whole.

[0044] Furthermore, if Figure 5 As shown, the second groove 112 is a spiral groove structure and extends spirally in the circumferential direction of the rotating shaft 1. Figure 5In the example, the second protrusion 22 on the inner wall surface of the injection molded part 2 is a spiral protrusion structure adapted to the second groove 112. By providing the spiral second groove 112, the second protrusion 22 forms an integrated structure with better structural strength, and the spiral groove is relatively easy to process, which is conducive to reducing the difficulty of processing.

[0045] Furthermore, if Figure 5 In the example, the first groove 111 is located on the other side of the knurled surface 101 opposite to the end flat structure 121, and at least a portion of the second groove 112 passes through the first groove 111 along the circumferential direction, so that the first groove 111 is connected with at least a portion of the second groove 112. During the injection molding operation, it can be beneficial to the flow of the injection plastic so that the injection plastic can be quickly filled into the second groove 112, which is beneficial to simplifying the operation and improving the efficiency of injection molding.

[0046] Furthermore, if Figure 5 and Figure 6 As shown, in the axial direction of the rotating shaft 1, the first groove 111 is located on one side of the knurled surface 101 close to the end flat structure 121, that is, Figure 5 The right side of the knurled surface 101 makes the center of gravity of the first protrusion 21 in the first groove 111 closer to the end flat structure 121, which can further improve the force situation and facilitate force balance. There is a first spacing between the first groove 111 and the edge of the knurled surface 101 close to the end flat structure 121, such as Figure 6 L1 shown in the figure makes the first protrusion 21 of the injection molded part 2 maintain a suitable spacing with the end edge of the knurled surface 101. It can be understood that if the first protrusion 21 is too close to the end edge of the knurled surface 101, it may cause uneven force between the injection molded part 2 and the assembly part 10 of the shaft 1, affecting the connection state between the two. By setting a suitable first spacing, the relative position relationship between the first groove 111 and the end flat structure 121 and the end edge of the knurled surface 101 can be effectively taken into account, so that the first protrusion 21 after injection molding is in a relatively suitable position, which is conducive to further improving the force condition.

[0047] Furthermore, if Figure 6 As shown, the sum of the axial dimension L2 of the first groove 111 and the first spacing L1 is less than or equal to half of the axial dimension L0 of the knurled surface 101. From the specific dimension, the first groove 111 is defined to be located on the side of the knurled surface 101 close to the end flattened structure 121, for example Figure 6 For example, in one specific implementation, Figure 6In the example, the axial dimension L0 of the first groove 111 is set to 20 mm, and the axial dimension L2 and the first spacing of the first groove 111 are both set to 5 mm, so that the first groove 111 is located as a whole on the right side of the symmetry axis of the knurled surface 101 to avoid affecting the left side of the symmetry axis of the knurled surface 101, and the right end of the first groove 111 directly maintains an appropriate first spacing with the right end of the knurled surface 101, which is equal to the axial dimension of the first groove 111, and the axial dimension of the first groove 111 only accounts for 1 / 4 of the axial dimension of the knurled surface 101.

[0048] In a further embodiment of the present invention, Figure 7 As shown, the circumferential side surface of the assembly portion 10 of the rotating shaft 1 is provided with a knurled surface 101, which can increase the contact area with the injection molded part 2 during injection molding. The groove structure also includes at least one second groove 112, and the second groove 112 is arranged on the knurled surface 101, as shown in FIG. Figure 7 In the example, the second grooves 112 specifically adopt an annular groove structure, the number is 5, and they are spaced apart in the axial direction of the rotating shaft 1; correspondingly, a second protrusion 22 is provided on the inner wall surface of the injection molded part 2, and the second protrusion 22 is adapted to the second grooves 112, adopting an annular protrusion structure, and each second protrusion 22 extends into the corresponding second groove 112 and is connected to the inner wall surface of the second groove 112.

[0049] It should be noted that, similar to the first protrusion 21, the second protrusion 22 can also be directly formed by injection molding, so that the second protrusion 22 extends into the second groove 112. After the injection molding is completed, the second protrusion 22 is naturally melted and connected with the inner wall surface of the second groove 112. Among them, the second groove 112 corresponding to the first groove 111 passes through the first groove 111 along the circumferential direction, that is, it is connected with the first groove 111, which is conducive to the flow of the injection material and facilitates the injection molding operation.

[0050] Preferably, the plurality of second grooves 112 are arranged at equal intervals in the axial direction.

[0051] In this embodiment, the second groove 112 with an annular groove structure is adopted to make the force at each angle in the circumferential direction more uniform, which is conducive to further improving the force between the rotating shaft 1 and the injection molded part 2. Other aspects are similar to the spiral groove structure in the previous embodiment and will not be repeated here.

[0052] In a further embodiment of the present invention, the injection molded part 2 of the rotor assembly 100 is made of glass fiber mixed with any one of nylon 6 (PA6), nylon 66 (PA66) or PBT polyester (polybutylene terephthalate). Preferably, in the above mixture, the content of glass fiber is in the range of 0% to 50%, and various properties of the mixture meet the processing requirements.

[0053] Furthermore, if Figure 8 As shown, a plurality of assembly grooves 23 are provided on the injection molded part 2 at intervals along the circumferential direction, an iron core 24 is provided in each assembly groove 23, and magnets 25 are provided in the injection molded part 2 at intervals from the iron core 24 in the circumferential direction. The iron core 24 and the magnet 25 are assembled with the rotating shaft 1 through the injection molded part 2 to form a rotor assembly 100, so that when applied to a motor, it is beneficial to form an electromagnetic induction effect between the rotor assembly 100 and the stator, drive the rotor assembly 100 to rotate, and output torque through the rotating shaft 1.

[0054] In a specific embodiment of the present invention, Figure 5 and Figure 6 As shown, the rotor assembly 100 includes a rotating shaft 1 and an injection molded part 2. The rotating shaft 1 is provided with an assembly portion 10 for connecting the injection molded part 2. The end of the rotating shaft 1 away from the assembly portion 10 is the shaft extension end 12, and the side wall of the rotating shaft 1 is provided with an end flattened structure 121 near the shaft extension end 12. The circumferential side surface of the assembly portion 10 is provided with a knurled surface 101, and the other side of the knurled surface 101 opposite to the end flattened structure 121 is provided with a first groove 111, and the first groove 111 specifically adopts a flattened groove structure, and the first groove 111 and the end flattened structure 121 differ by 180 degrees in the circumferential direction.

[0055] like Figure 5 and Figure 6 As shown, in the axial direction of the rotating shaft 1, there is a first spacing L1 between the first groove 111 and the edge of one end of the knurled surface 101 close to the end flattened structure 121, the axial dimension of the first groove 111 is L2, and the axial dimension of the knurled surface 101 is L0; wherein the sum of the axial dimension L2 of the first groove 111 and the first spacing L1 is less than or equal to half of the axial dimension L0 of the knurled surface 101, and from the aspect of specific dimensions, it is defined that the first groove 111 is located on the side of the knurled surface 101 close to the end flattened structure 121, for example Figure 6 Specifically, the axial dimension L0 of the first groove 111 is set to 20 mm, and the axial dimension L2 and the first spacing of the first groove 111 are both set to 5 mm, so that the first groove 111 is located on the right side of the symmetry axis of the knurled surface 101 as a whole, and the axial dimension L2 of the first groove 111 is the same as the first spacing L1, both of which are 1 / 4 of the axial dimension of the knurled surface 101. Among them, the depth of the first groove 111 is in the range of 0 to 8 mm, which can be set according to specific circumstances.

[0056] like Figure 5 and Figure 6 As shown, a second groove 112 is formed on the knurled surface 101 . The second groove 112 is specifically a spiral groove structure and extends in a spiral along the circumference of the rotating shaft 1 .

[0057] The injection molded part 2 is injection molded by mixing glass fiber with any one of nylon 6 (PA6), nylon 66 (PA66) or PBT polyester (polybutylene terephthalate), wherein the content of the glass fiber is in the range of 0% to 50%.

[0058] like Figure 5 As shown, corresponding to the rotating shaft 1, the injection molded part 2 is injection molded on the outer side of the assembly part 10 of the rotating shaft 1, and circumferentially covers the assembly part 10. After molding, the injection molded part 2 is an annular structure; the first protrusion 21 and the second protrusion 22 are formed on the inner wall surface of the injection molded part 2. Specifically, the first protrusion 21 is a block structure adapted to the first groove 111, the first protrusion 21 extends into the first groove 111, and is melt-connected with the inner wall surface of the first groove 111; the second protrusion 22 is a spiral structure adapted to the second groove 112, the second protrusion 22 extends into the second groove 112, and is melt-connected with the inner wall surface of the second groove 112. After injection molding, the overall dynamic unbalance of the rotor assembly 100 can be controlled within 500 mg, which has reached the required range of the dynamic balance state.

[0059] like Figure 8 As shown, the injection molded part 2 is provided with a plurality of assembly grooves 23 at intervals along the circumferential direction, and an iron core 24 is provided in each assembly groove 23; and in the circumferential direction, a magnet 25 is provided inside the injection molded part 2 located between two adjacent iron cores 24, for example, a permanent magnet can be used; the iron core 24 and the magnet 25 are assembled with the rotating shaft 1 through the injection molded part 2 to form a rotor assembly 100. When the rotor assembly 100 is applied to the motor, it is beneficial to form an electromagnetic induction effect between the iron core 24 and the magnet 25 of the rotor assembly 100 and the stator, thereby driving the rotor assembly 100 to rotate and outputting torque through the rotating shaft 1.

[0060] The rotor assembly 100 in this embodiment improves the structure and connection method of the rotating shaft 1 and the injection molded part 2, and utilizes the groove structure on the rotating shaft 1 to cooperate with the injection molded part 2 to compensate for the uneven weight caused by the end flat structure 121, so that the rotor assembly 100 can achieve dynamic balance as a whole, and at the same time can improve the connection strength and stability between the rotating shaft 1 and the injection molded part 2; the overall dynamic balance can be achieved after injection molding, without the need to set up additional counterweights or perform dynamic balance correction, which facilitates the realization of lightweight structural design, simplifies the processing and manufacturing process, and is conducive to improving production efficiency.

[0061] In an embodiment of the second aspect of the present utility model, a motor is provided, such as Figure 1 and Fig. 9As shown, the motor 300 includes the rotor assembly 100 in any embodiment of the first aspect. The weight loss of the end flat structure 121 of the shaft 1 is offset by the groove structure on the shaft 1 of the rotor assembly 100 and the injection molded part 2, so as to achieve overall dynamic balance.

[0062] Furthermore, in practical applications, the motor 300 may also include other mechanisms that are compatible with the rotor assembly 100, such as a stator, etc., which will not be described in detail here.

[0063] In addition, the motor 300 in this embodiment also includes all the beneficial effects of the rotor assembly 100 in any embodiment of the first aspect mentioned above, which will not be repeated here.

[0064] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0065] The block diagrams of the devices, apparatuses, equipment and systems involved in the present utility model are only illustrative examples and are not intended to require or imply that they must be connected, arranged and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment and systems can be connected, arranged and configured in any manner. Words such as "including", "comprising", "having" and the like are open words, referring to "including but not limited to" and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to" and can be used interchangeably with them. It should also be noted that in the apparatus and equipment of the present utility model, each component can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present utility model.

[0066] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize some variations, modifications, changes, additions and sub-combinations thereof. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the utility model. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the utility model. Therefore, the utility model is not intended to be limited to the aspects shown herein, but in accordance with the widest range consistent with the principles and novel features of this utility model.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotating shaft (1), wherein the rotating shaft (1) is provided with a mounting portion (10), and an end of the rotating shaft (1) away from the mounting portion (10) is a shaft extension end (12), an end flattened structure (121) is provided on a side wall of the rotating shaft (1) near the shaft extension end (12), the mounting portion (10) is provided with a groove structure, and at least part of the groove structure is located on the other side of the rotating shaft (1) opposite to the end flattened structure (121); An injection molded part (2) is sleeved on the rotating shaft (1) and circumferentially covers the assembly portion (10); Part of the injection molded part (2) extends into the groove structure, and puts the rotor assembly as a whole in a dynamic balance state.

2. The rotor assembly according to claim 1, characterized in that The groove structure comprises a first groove (111), the first groove (111) being located on the other side of the rotating shaft (1) opposite to the end flattened structure (121) and being recessed inwardly along the lateral direction of the rotating shaft (1); The injection molded part (2) is an annular structure, and a first protrusion (21) is provided on the inner wall surface of the injection molded part (2) at a position opposite to the first groove (111), and the first protrusion (21) extends into the first groove (111) and is connected to the inner wall surface of the first groove (111).

3. The rotor assembly according to claim 2, characterized in that: The first groove (111) is a flat groove structure.

4. The rotor assembly according to claim 2, characterized in that: A knurled surface (101) is provided on the circumferential side surface of the assembly portion (10); The groove structure further comprises at least one second groove (112), wherein the second groove (112) is arranged on the knurled surface (101) and extends along the circumference of the rotating shaft (1); A second protrusion (22) adapted to the second groove (112) is also provided on the inner wall surface of the injection molded part (2); the second protrusion (22) extends into the second groove (112) and is connected to the inner wall surface of the second groove (112).

5. The rotor assembly according to claim 4, characterized in that: The second groove (112) is a spiral groove structure or an annular groove structure.

6. The rotor assembly according to claim 4, characterized in that: The first groove (111) is located on the other side of the knurled surface (101) opposite to the end flattened structure (121), and at least a portion of the second groove (112) passes through the first groove (111) in the circumferential direction.

7. The rotor assembly according to claim 6, characterized in that In the axial direction, the first groove (111) is located on a side of the knurled surface (101) close to the end flattened structure (121), and a first distance exists between the first groove (111) and an end edge of the knurled surface (101) close to the end flattened structure (121).

8. The rotor assembly according to claim 7, characterized in that The sum of the axial dimension of the first groove (111) and the first spacing is less than or equal to half of the axial dimension of the knurled surface (101).

9. The rotor assembly according to any one of claims 1 to 8, characterized in that: The injection molded part (2) is made by mixing glass fiber with any one of nylon 6, nylon 66 or PBT polyester.

10. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 9.

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