Rotor assembly and motor
By setting a correction structure and filling the balanced medium on the main body of the rotor, the problem of imbalance of rotor stress is solved, and the work stability and service life of the motor are improved.
Patent Information
- Application Number
- CN202323339425.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-07
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2033-12-07
AI Technical Summary
During the rotor rotation, the stress imbalance caused by dimensional tolerances and non-axially symmetrical structure leads to motor vibration, noise and service life problems.
Set up correction structures on the main body of the rotor, such as the correction structure of a groove or pore -shaped shape, which can be filled with a balanced medium to achieve a balanced correction to the rotor assembly.
By filling the balanced medium and reasonably layout the correction structure, improve the stability of the rotor assembly, reduce vibration and noise, and extend the service life of the motor.
Smart Images
Figure CN222423336U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor comprising the rotor assembly. Background Art
[0002] The motor is mainly composed of a rotor and a stator. The rotor rotates when the motor is running. Due to the tolerance of the dimensions of the rotor components and the rotor itself, or the non-axisymmetric structure of the rotor itself, the rotor will have an unbalanced force problem during rotation, which will cause vibration and noise during the operation of the motor and even affect the service life of the motor. Therefore, dynamic balancing correction is required after the rotor is produced. Utility Model Content
[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one purpose of the utility model is to provide a rotor assembly, which improves the effect and reliability of the balance correction of the rotor assembly and improves the working stability of the rotor assembly by arranging a correction structure on the rotor body.
[0004] Another object of the present invention is to provide a motor, comprising the aforementioned rotor assembly.
[0005] According to the rotor assembly of the embodiment of the utility model, it includes a rotor body, on which a groove-shaped or hole-shaped correction structure is provided. The correction structure is arranged along the circumference of the rotor body, and a balancing medium can be filled in the correction structure to balance and correct the rotor assembly. The minimum distance between the correction structure and the outer periphery of the rotor body is L1, and the distance between the correction structure and the rotation axis of the rotor body is L2. The ratio of L1 to L2, L1 / L2, is less than 1.
[0006] According to the rotor assembly of the embodiment of the utility model, a correction structure is provided on the rotor body, and a balancing medium can be filled in the correction structure, so that the balancing medium can be stably embedded in the rotor body to avoid interference between the balancing medium and other structures. The correction structure can support the balancing medium, and the balancing medium is not easy to fall off during the operation of the motor, so as to effectively balance and calibrate the rotor assembly. By reasonably arranging the position of the correction structure, the force arm of the balancing medium when the rotor rotates is increased, so as to better exert the correction effect of the balancing medium and improve the stability of the rotor during operation.
[0007] In addition, the rotor assembly according to the above embodiment of the utility model may also have the following additional technical features:
[0008] In some embodiments, a ratio of L1 to L2, L1 / L2, is not greater than 0.1 and not less than 0.005.
[0009] In some embodiments, the correction structure includes a plurality of correction holes, which are arranged at intervals along the circumference of the rotor body, and the correction holes can be filled with a correction medium.
[0010] In some embodiments, the correction hole extends in a direction parallel to the rotation axis of the rotor assembly; and / or, the cross-section of the correction hole is configured to be an oblong shape extending along the circumference of the rotor body; and / or, the plurality of correction holes accounts for less than 50% of the circumference of the rotor body; and / or, the plurality of correction holes are evenly spaced along the circumference of the rotor body.
[0011] In some embodiments, the correction structure includes a groove provided on the rotor body, and the groove extends continuously or discontinuously along the circumference of the rotor body.
[0012] In some embodiments, the correction structure is disposed on one side surface of the rotor body along the axial direction, wherein the correction structure penetrates the rotor body along the axial direction; or the correction structure is spaced apart from the other side surface of the rotor assembly along the axial direction.
[0013] In some embodiments, the rotor body includes a bottom wall and a peripheral wall, the peripheral wall is connected to the peripheral edge of the bottom wall and extends along the circumference of the bottom wall, the inner side of the peripheral wall is configured to form an accommodating space for placing the stator, wherein the corrective structure is opposite to the peripheral wall in the axial direction of the rotor assembly; or, in the projection in the axial direction of the rotor assembly, the corrective structure falls between the inner ring and the outer ring of the peripheral wall; or, in the projection in the axial direction of the rotor assembly, the corrective structure falls between the inner ring and the outer ring of the peripheral wall and has a gap with the inner ring and the outer ring of the peripheral wall.
[0014] In some embodiments, the rotor assembly further includes a rotor shaft connected to the bottom wall and extending along a rotation axis of the rotor assembly.
[0015] The motor according to the embodiment of the utility model comprises: the aforementioned rotor assembly and stator assembly, wherein the stator assembly cooperates with the rotor assembly to drive the rotor assembly to rotate.
[0016] In some embodiments, the motor further includes a correction pin, which is inserted into the correction structure and is relatively stationary with respect to the rotor body; and / or, further includes balancing mud, which is filled in the correction structure.
[0017] According to the motor of the embodiment of the utility model, by providing a correction structure, it is possible to improve the efficiency and effect of balancing and calibrating the rotor assembly, improve the working reliability of the rotor assembly, improve the working stability of the motor, and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the rotor assembly of an embodiment of the utility model.
[0019] Figure 2 It is an exploded schematic diagram of the rotor assembly of the embodiment of the utility model.
[0020] Figure 3 It is a schematic top view of the rotor assembly of an embodiment of the utility model.
[0021] Figure 4 It is a schematic structural diagram of the rotor assembly of other embodiments of the utility model.
[0022] Figure 5 It is a schematic structural diagram of the rotor assembly of some embodiments of the utility model from another angle.
[0023] Figure 6 It is a schematic structural diagram of the rotor assembly of some further embodiments of the utility model.
[0024] Figure 7 It is a structural schematic diagram of an insert of a rotor assembly according to an embodiment of the utility model.
[0025] Reference numerals:
[0026] Rotor assembly 100, rotor body 10, correction structure 11, balancing medium 12, bottom wall 13, peripheral wall 14, accommodating space 141, inner ring 142, outer ring 143, bottom surface 15, injection molded part 16, rotor shaft 20, insert 30, magnetic part 31, iron core 32, rotating axis A. DETAILED DESCRIPTION
[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0028] The rotor assembly 100 according to the embodiment of the utility model can be applied to a motor, wherein the motor may include a rotor assembly 100 and a stator assembly, the stator assembly cooperates with the rotor assembly 100 to drive the rotor assembly 100 to rotate, and the rotation of the rotor assembly 100 generates mechanical energy, thereby driving the motor to work.
[0029] Combination Figure 1 and Figure 2 According to the embodiment of the present utility model, the rotor assembly 100 may include a rotor body 10, on which a groove-shaped or hole-shaped correction structure 11 is provided, the correction structure 11 is arranged along the circumference of the rotor body 10, and the correction structure 11 may be filled with a balancing medium 12 to balance the rotor assembly 100. Specifically, the correction structure 11 may be a groove-shaped structure or a hole-shaped structure arranged along the circumference of the rotor body 10, so that the balancing medium 12 can be stably embedded in the correction structure 11.
[0030] It is understandable that, because there may be tolerances in the size of the rotor assembly 100, or because the rotor itself has a non-axisymmetric structure, the rotor is prone to uneven force during rotation, and a balancing medium 12 is filled in the correction structure 11 to reduce the imbalance and vibration generated by the rotor during rotation. By setting the correction structure 11 to a slot-shaped or hole-shaped structure, the balancing medium 12 can be filled in the correction structure 11 when performing balancing correction. After the rotor is assembled to the motor, it can be avoided that the balancing medium 12 protrudes from the surface of the rotor assembly 100 and interferes with other structures. In addition, the balancing medium 12 is filled in the correction structure 11, and the correction structure 11 can support the balancing medium 12. The balancing medium 12 is not easy to fall off during the operation of the motor, so as to effectively balance the rotor and improve the stability of the rotor assembly 100 during operation. Compared with the related art, in which weight is added by sticking dynamic balancing putty, the balancing medium 12 is filled in the correction structure 11, and there is no need to dry the balancing medium 12 separately, and the assembly of the motor is not affected. After the balancing calibration, the next step can be carried out directly, thereby improving the efficiency of the operation.
[0031] According to the rotor assembly 100 of the embodiment of the utility model, a hole-shaped or groove-shaped correction structure 11 is provided on the rotor body 10 to reserve space for filling the balancing medium 12. The balancing medium 12 is filled in the correction structure 11, which can prevent the balancing medium 12 from protruding from the surface of the rotor assembly 100 and interfering with other components. The balancing medium 12 can be supported by the correction structure 11, thereby improving the stability of the balancing medium 12, solving the problems of interference between the existing balancing medium 12 and components, easy falling off, and time required for solidification that affects assembly efficiency, and providing a safe, reliable, and efficient rotor balancing correction method, thereby improving the balancing correction efficiency of the rotor assembly 100 and the stability during operation.
[0032] Among them, the shape and size of the correction structure 11 can be adjusted according to the actual unbalance requirement of the rotor assembly 100 and the structural space of the rotor assembly 100. For example, if the unbalance requirement of the rotor assembly 100 is large, multiple correction structures 11 can be set to facilitate filling the balancing medium 12 in the corresponding correction structure 11 according to different correction requirements, thereby improving the efficiency of the balance calibration of the rotor assembly 100. If the unbalance requirement of the rotor assembly 100 is small, a relatively small number of correction structures 11 can be set to improve the processing efficiency of the rotor assembly 100. The correction structure 11 can be hole-shaped, such as a circular hole, an oblong hole, a square hole or a special-shaped hole, etc., and multiple holes can be arranged at intervals along the circumference of the rotor body 10; the correction structure 11 can also be groove-shaped, such as an annular groove arranged circumferentially along the rotor body 10, or multiple grooves arranged at intervals along the circumference of the rotor body 10.
[0033] The balancing medium 12 can be different substances, for example, it can be clay, which can be filled in the correction structure 11. Different amounts of clay can be filled in the correction structure 11 according to the actual balancing requirements. By filling the clay in the correction structure 11, it can be avoided that the clay sticks to the surface of the rotor assembly 100 and interferes with the structure near the rotor, and it can also be avoided that the clay sticks unstably and falls off, affecting the balancing calibration effect of the rotor. The balancing medium 12 can also be a dynamic balancing pin, which matches the correction structure 11 in size to fix the dynamic balancing pin in the correction structure 11. The dynamic balancing pin can stably balance and calibrate the rotor assembly 100 and avoid interference between the dynamic balancing pin and other structures. Of course, the balancing medium 12 can also be other substances, which can be easily obtained by those skilled in the art based on the above description, and the applicant will not elaborate on them.
[0034] Combination Figure 1 In some embodiments of the present invention, the correction structure 11 is closer to the periphery of the rotor body 10 than the rotation axis of the rotor body 10. The rotor body 10 rotates around the rotation axis. After the balancing medium 12 is filled into the correction structure 11, the balancing medium 12 is relatively far away from the rotation axis. The force arm of the balancing medium 12 when the rotor rotates is relatively larger, and a larger torque will be generated, thereby improving the balancing correction effect of the balancing medium 12, and can avoid filling more balancing medium 12 and increasing the weight of the rotor assembly 100.
[0035] Combination Figure 3In some embodiments of the present invention, the minimum distance between the correction structure 11 and the outer periphery of the rotor body 10 is L1, the distance between the correction structure 11 and the rotation axis of the rotor body 10 is L2, and the ratio L1 / L2 of L1 to L2 is less than 1. It should be noted that the correction structure 11 can be set to different shapes and structures. For example, when the correction structure 11 is an elliptical hole, a special-shaped hole or a special-shaped groove, the correction structure 11 and the outer periphery of the rotor body 10 have different distances, and L1 is the minimum distance between the correction structure 11 and the outer periphery of the rotor body 10. In other words, the distance between the correction structure 11 and the outer periphery of the rotor body 10 is smaller than the distance between the correction structure 11 and the rotation axis of the rotor body 10. By rationally arranging the position of the correction structure 11, increasing the distance between the correction structure 11 and the rotation axis, and reducing the distance between the correction structure 11 and the outer periphery of the rotor body 10, the force arm of the balancing medium 12 when the rotor rotates is increased, so as to better play the balancing correction role of the balancing medium 12 and avoid filling too much balancing medium 12. For example, L1 / L2 can be 0.7, 0.5, 0.2, 0.1, etc.
[0036] Furthermore, the ratio L1 / L2 of L1 and L2 is not greater than 0.1 and not less than 0.005. By setting the ratio of L1 to L2 within this range, the correction structure 11 can be close to the outer edge of the rotor body 10, which not only ensures the structural stability of the correction structure 11, but also maximizes the distance between the correction structure 11 and the rotation axis, so as to maximize the balancing correction effect of the balancing medium 12.
[0037] In some embodiments of the present invention, the correction structure 11 may include a plurality of correction holes, which are arranged at intervals along the circumference of the rotor body 10, and the correction holes may be filled with a balancing medium 12. By providing a plurality of correction holes, when balancing and correcting the rotor assembly 100, the balancing medium 12 is filled into the corresponding correction holes according to the size and position of the unbalanced force, so as to improve the calibration efficiency of the rotor assembly 100.
[0038] Furthermore, the correction hole may extend in a direction parallel to the rotation axis of the rotor assembly 100. The opening direction of the correction hole may be toward the axial direction of the rotor assembly 100. For example, the rotation axis extends in the up-down direction, and the correction hole also extends in the up-down direction, which can ensure that the rotation direction of the balancing medium 12 is consistent with the rotation axis direction and the rotation direction of the rotor assembly 100, further improving the balancing correction effect of the balancing medium 12 on the rotor assembly 100, reducing the uneven distribution of the balancing medium 12 and affecting the balancing correction effect on the rotor assembly 100, and the correction hole extends in a direction parallel to the rotation axis of the rotor assembly 100, which can prevent the balancing medium 12 from falling off from the correction structure 11 when the motor is running, and improve the working stability of the rotor assembly 100.
[0039] Combination Figure 1 In some embodiments of the present invention, the cross-section of the correction hole is configured to be an oblong extending along the circumference of the rotor body 10, wherein the long side of the oblong hole can extend along the circumferential direction of the rotor body 10. In this way, the correction hole can be closer to the periphery of the rotor body 10, and the distance between the correction structure 11 and the rotating shaft can be increased. After filling the balancing medium 12, the force arm of the balancing medium 12 can be increased to generate a larger torque, thereby improving the correction effect of the balancing medium 12.
[0040] In some embodiments of the present invention, the proportion of the plurality of correction holes in the circumferential direction of the rotor body 10 is less than 50%, which can increase the structural stability of the correction holes. For example, the plurality of correction holes can be evenly spaced along the circumference of the rotor body 10, and the distance between two adjacent correction holes is greater than the aperture of a single correction hole to ensure the structural stability of the correction holes.
[0041] In some embodiments of the present invention, a plurality of correction holes are evenly spaced along the circumference of the rotor body 10 , and the correction holes are evenly arranged to facilitate filling of the balancing medium 12 in the corresponding correction holes according to actual imbalance requirements, thereby improving the balancing calibration efficiency of the rotor assembly 100 .
[0042] In some embodiments of the present invention, the correction structure 11 may include a groove provided on the rotor body 10, and the groove extends continuously or discontinuously along the circumference of the rotor body 10. In other words, the correction structure 11 may be an annular groove provided on the rotor body 10, or a groove extending discontinuously along the circumference of the rotor body 10. By providing a groove structure, it is convenient to fill the balancing medium 12 in the corresponding position of the groove according to the actual imbalance demand, thereby improving the balance calibration efficiency of the rotor assembly 100, avoiding multiple adjustments to the calibration position, and filling too much balancing medium 12.
[0043] In some embodiments of the utility model, the correction structure 11 is provided on one side surface of the rotor body 10 along the axial direction. The correction structure 11 penetrates the rotor body 10 along the axial direction. In other words, the correction structure 11 can be a through-hole. The correction structure 11 can also be provided to be separated from the other side surface of the rotor assembly 100 along the axial direction. In other words, the correction structure 11 can be a blind hole. By providing a through-hole and a blind hole structure, the balancing medium 12 is filled in the correction structure 11. During the rotation of the rotor, the hole wall can support the balancing medium 12, and the balancing medium 12 is not easy to fall off from the rotor assembly 100, thereby improving the stability of the rotor assembly 100 during operation.
[0044] Preferably, the correction structure 11 is separated from the other side surface of the rotor assembly 100 along the axial direction, that is, the correction structure 11 is a blind hole structure, so that the correction structure 11 can be filled with a balancing medium 12 of different materials. For example, the correction structure 11 can be filled with glue, or balancing pins can be driven into the correction structure 11.
[0045] Combination Figure 4 In some embodiments of the present invention, the rotor body 10 includes a bottom wall 13 and a peripheral wall 14. The peripheral wall 14 is connected to the periphery of the bottom wall 13 and extends along the circumference of the bottom wall 13. The inner side of the peripheral wall 14 is configured with an accommodation space 141 for placing the stator. In other words, the rotor assembly 100 can be applied to an external rotor motor. The bottom wall 13 and the peripheral wall 14 of the rotor body 10 surround the accommodation space 141 to place the stator, which can improve the compactness of the motor structure and facilitate the heat dissipation and load-bearing capacity of the rotor assembly 100. Figure 5 The correction structure 11 is opposite to the peripheral wall 14 in the axial direction of the rotor assembly 100 to facilitate the molding and manufacturing of the rotor body 10 , and the peripheral wall 14 can provide support for the correction structure 11 to enhance the structural strength and stability of the correction structure 11 .
[0046] Combination Figure 4 and Figure 5 In some embodiments of the present invention, in the projection on the axis direction of the rotor assembly 100, the correction structure 11 falls between the inner ring 142 and the outer ring 143 of the peripheral wall 14. Specifically, the peripheral wall 14 of the rotor body 10 has the inner ring 142 and the outer ring 143, which can improve the structural strength of the rotor body 10 and the working stability of the rotor assembly 100. The correction structure 11 falls between the inner ring 142 and the outer ring 143, and the peripheral wall 14 can provide effective support for the correction structure 11. On the one hand, the structural strength and stability of the correction structure 11 can be improved, so that after the balancing medium 12 is filled into the correction structure 11, the correction structure 11 can provide effective support for the balancing medium 12. On the other hand, the force arm of the balancing medium 12 when the rotor rotates can be increased to better play the balancing calibration role of the balancing medium 12 and avoid filling too much balancing medium 12.
[0047] Furthermore, there is a gap between the correction structure 11 and the inner ring 142 and the outer ring 143 of the peripheral wall 14 to facilitate the processing and forming of the correction structure 11. The inner ring 142 and the outer ring 143 cooperate to provide support for the correction structure 11, thereby improving the structural strength of the correction structure 11, ensuring that the correction structure 11 can effectively support the balancing medium 12, and improving the working reliability of the rotor assembly 100. Among them, there may be an insert 30 between the inner ring 142 and the outer ring 143 of the peripheral wall 14. For example, the insert 30 may be a magnetic part, an iron core, etc., so that the layout of the rotor assembly 100 is compact and the structural strength can be improved.
[0048] Combination Figure 5 and Figure 6 In some embodiments of the present invention, the rotor assembly 100 also includes a rotor shaft 20, which is connected to the bottom wall 13 and extends along the rotation axis of the rotor assembly 100. The rotor shaft 20 can support and fix the rotor. When the motor is energized, the magnetic field generated by the stator interacts with the magnetic field of the rotor to generate torque, causing the rotor to start rotating. The rotor shaft 20 transmits the rotational power to external equipment, which can be a fan, a pump, a compressor, etc.
[0049] The motor according to the embodiment of the utility model comprises the aforementioned rotor assembly 100 and stator assembly, and the stator assembly cooperates with the rotor assembly 100 to drive the rotor assembly 100 to rotate. The motor can be an outer rotor motor or an inner rotor motor, and the present application does not limit the type of the motor.
[0050] In some embodiments of the utility model, the motor may further include a correction pin, which is inserted into the correction structure 11 and relatively stationary with the rotor body 10. The correction structure 11 may be matched with the correction pin size to fix the correction pin in the correction structure 11, or the correction pin may be fixed in the correction structure 11 in other ways to achieve the balance correction of the rotor assembly 100. By fixing the correction pin in the correction structure 11, the balance calibration of the rotor assembly 100 is reliable and stable, thereby improving the working stability of the rotor assembly 100. The correction pin may be a dynamic balancing pin, and a plurality of correction structures 11 may be provided along the circumference of the rotor body 10. The position and mass of the dynamic balancing pin may be adjusted according to the actual balancing requirements to improve the efficiency of the balance calibration of the rotor assembly 100, and the correction pin may be stably fixed in the correction structure 11 to improve the efficiency and reliability of the balance calibration of the rotor assembly 100.
[0051] In some embodiments of the utility model, the motor also includes balancing mud, and the balancing mud is filled in the correction structure 11. When performing dynamic balancing correction of the rotor assembly 100, the balancing mud can be filled in the correction structure 11 to ensure that the balancing mud will not interfere with other structures after the rotor assembly 100 is assembled on the motor. In addition, since the balancing mud is supported in all directions in the correction structure 11, it is not easy to fall off during the operation of the motor. And since the balancing mud is in the correction structure 11, it will not interfere with other assemblies. Therefore, in the process of assembling the motor, the next step of assembly can be carried out directly after completing the balance calibration, thereby improving the assembly efficiency of the motor. Among them, the balancing mud can be a substance such as glue mud.
[0052] Optionally, combined Figure 6 and Figure 7The rotor body 10 may include an injection molded part 16 and an insert 30, wherein the insert 30 is connected to the injection molded part 16, and at least a portion of the insert 30 is embedded in the injection molded part 16, and at least one end of the rotor assembly 100 in the axial direction, the corresponding portion of the injection molded part 16 and the insert 30 is removed to expose the insert 30, wherein the corresponding portion of the injection molded part 16 and the insert 30 may be removed to expose the insert 30 at one end of the rotor assembly 100 in the axial direction, or the corresponding portion of the injection molded part 16 and the insert 30 may be removed to expose the insert 30 at both ends of the rotor assembly 100 in the axial direction.
[0053] Specifically, the injection molded part 16 refers to a part obtained by injecting molten plastic material into a mold through an injection molding process, and then cooling and curing. The injection molded part 16 can be used to make the outer shell, end cover and other components of the rotor assembly 100. The injection molded part 16 can provide structural support for the rotor assembly 100 and protect the structure inside the rotor assembly 100. Among them, the insert 30 can be a magnetic tile, a magnetic ring, an iron core 32, a cover plate and other components. At least a portion of the insert 30 is embedded in the injection molded part 16. The injection molded part 16 cooperates with the insert 30 through the injection molding process to ensure the operation and performance of the rotor assembly 100. The process of cooperating the injection molded part 16 with the insert 30 can improve the structural stability and production efficiency of the rotor assembly 100. It can be understood that for the injection molded rotor body 10, since it is necessary to fix the position of the insert 30 in the injection molded part 16, it is necessary to provide positioning for the insert 30. A positioning hole will be formed on the injection molded part 16. During the injection molding process, the plastic is melted and fills the mold cavity, and then cooled and solidified. Since the plastic will shrink during the cooling process, and the mold will limit the shrinkage, stress will be generated. In addition, the positioning hole is also prone to stress concentration when subjected to force. This stress will cause deformation, cracking and other problems of the injection molded part 16. By removing the corresponding part of the injection molded part 16 and the insert 30 at at least one end of the rotor assembly 100 in the axial direction and exposing the insert 30, it is avoided that the injection molded part 16 forms an all-round wrapping of the insert 30. When the injection molded part 16 is deformed, the stress can be released at the position where the corresponding removal of the injection molded part 16 and the insert 30 is removed, so as to prevent the problem of excessive stress in the injection molded part 16 and cracking, thereby improving the structural strength of the injection molded part 16 and thereby improving the reliability of the rotor body 10. The portion of the injection molded part 16 corresponding to the insert 30 is removed to expose the insert 30 , which can be achieved through the structural design of the mold.
[0054] According to the rotor assembly 100 of the embodiment of the present invention, by removing the portion corresponding to the injection molded part 16 and the insert 30 and exposing the insert 30, the injection molded part 16 can release stress through the removed portion after injection molding, thereby preventing the injection molded part 16 from cracking due to excessive stress. The stress of the injection molded part 16 can be released through the removed portion, thereby improving the temperature shock resistance of the injection molded part 16. The method of eliminating stress of the rotor assembly 100 of the embodiment of the present invention is not limited by the size of the rotor assembly 100, and is suitable for rotor assemblies 100 of different sizes. In addition, this method does not affect the overall size of the rotor assembly 100. For example, in the related art, reinforcing ribs are usually provided in the injection molded part 16 or the rotor assembly 100 is directly thickened to forcibly reduce the stress value. The method of providing reinforcing ribs in the injection molded part 16 is easily limited by the size of the rotor assembly 100, and the method of thickening the rotor assembly 100 is likely to increase the size and weight of the rotor assembly 100, and does not fundamentally solve the problem of stress concentration. Moreover, when the size of the rotor assembly 100 is limited, this solution is difficult to implement.
[0055] Among them, at least one end of the rotor assembly 100 in the axial direction, the portion of the injection molded part 16 corresponding to the insert 30 is removed to expose the insert 30. It can be that at one end in the axial direction, the portion of the injection molded part 16 that is higher than the insert 30 is removed to expose the insert 30, or the outer side or inner side of the injection molded part 16 is removed to expose the insert 30. The injection molded part 16 can also be set to a hollow structure to maximize the release of the stress generated by the injection molded part 16 during deformation or temperature changes, thereby improving the temperature resistance of the injection molded part 16.
[0056] In some embodiments of the present invention, at one end of the rotor assembly 100 in the axial direction, the portion of the injection molded part 16 that is higher than the insert 30 is removed. Specifically, the portion of the injection molded part 16 that is higher than the insert 30 can be removed at the top of the rotor assembly 100 in the axial direction, or the portion of the injection molded part 16 that is higher than the insert 30 can be removed at the bottom of the rotor assembly 100 in the axial direction. By removing the portion of the injection molded part 16 that is higher than the insert 30, it is possible to avoid the injection molded part 16 wrapping the insert 30 in all directions, and when the injection molded part 16 is deformed due to temperature changes or force deformation, the stress can be released through the removed portion, thereby avoiding the problem of cracking of the injection molded part 16 due to excessive stress. In addition, the portion of the injection molded part 16 that is higher than the insert 30 can be removed at the bottom end of the rotor assembly 100 in the axial direction. In other words, the portion of the bottom surface 15 of the injection molded part 16 that is higher than the insert 30 is removed. At this time, the bottom surface 15 of the insert 30 will be exposed, and the exposed portion of the insert 30 can also play a positioning role in the axial direction. Therefore, there is no need to set an additional positioning hole on the rotor assembly 100, thereby avoiding the generation of positioning holes on the injection molded part 16, and the positioning holes are prone to stress concentration problems, further reducing the stress problem of the injection molded part 16, and improving the temperature shock resistance of the injection molded part 16. The injection molded part 16 can better provide fixation and protection for the insert 30, thereby improving the reliability of the motor.
[0057] In some embodiments of the present invention, at one end of the rotor assembly 100, the end face of the injection molded part 16 and the end face of the insert 30 are flush, smoothly transitioned, or have steps. Specifically, the axial end of the rotor assembly 100 may be the top end of the rotor assembly 100 in the axial direction, or the bottom end of the rotor assembly 100 in the axial direction. Preferably, at one end of the axial bottom surface 15 of the rotor assembly 100, the portion of the injection molded part 16 corresponding to the insert 30 is removed, wherein the end face of the injection molded part 16 and the end face of the insert 30 may be flush, and the bottom surface 15 of the insert 30 may be used as a positioning surface in the axial direction. The removed portion of the injection molded part 16 may release stress, and avoid setting a positioning hole on the injection molded part 16, thereby eliminating the problem of stress concentration when the positioning hole is subjected to force, so that the injection molded part 16 and the insert 30 can be stably matched, thereby improving the structural strength of the injection molded part 16. The end faces of the injection molded part 16 and the insert 30 may also have a smooth transition, and there is no sudden change in the contact position between the end faces of the injection molded part 16 and the insert 30, so as to reduce the stress concentration between the injection molded part 16 and the insert 30 which may cause the injection molded part 16 to crack, and improve the connection strength between the injection molded part 16 and the insert 30; in some embodiments of the present invention, the end faces of the injection molded part 16 and the insert 30 may also have steps to limit the injection molded part 16 and the insert 30, and improve the stability of the connection structure between the injection molded part 16 and the insert 30.
[0058] In some embodiments of the present invention, the injection molded part 16 includes a peripheral wall 14, and the insert 30 is embedded in the peripheral wall 14. On at least one side of the rotor assembly 100 in the radial direction, at least the portion of the injection molded part 16 corresponding to the insert 30 is configured as a hollow structure, wherein the portion of the injection molded part 16 corresponding to the insert 30 may be configured as a hollow structure on the radial inner side of the rotor assembly 100, or on the radial outer side of the rotor assembly 100, or on the radial inner and outer sides of the rotor assembly 100. By setting the hollow structure, when the injection molded part 16 is deformed relative to the insert 30, the stress can be released at the hollow position, and the hollow structure can keep the injection molded part 16 with sufficient strength and rigidity, thereby improving the structural stability of the connection between the injection molded part 16 and the insert 30.
[0059] Furthermore, the insert 30 is embedded in the inner side of the peripheral wall 14 and exposed from the inner side of the peripheral wall 14. The injection molded part 16 can fix and support the insert 30 and play an effective protective role to ensure the working stability of the rotor assembly 100. A hollow structure is provided on the outer side of the peripheral wall 14 and the insert 30 is exposed to release the stress generated when the injection molded part 16 is deformed to the greatest extent. The hollow structure can ensure the structural strength of the injection molded part 16 to effectively fix, support and protect the insert 30, thereby improving the reliability of the rotor assembly 100.
[0060] In some embodiments of the present invention, the inner side surface of the insert 30 is flush with or smoothly transitions to the inner side surface of the peripheral wall 14 to improve the connection stability between the insert 30 and the injection molded part 16 and avoid stress concentration problems between the insert 30 and the injection molded part 16 .
[0061] In some embodiments of the present invention, at one axial end of the rotor assembly 100, the inner edge of the insert 30 is rounded or chamfered so that the inner edge of the insert 30 is recessed compared to the corresponding edge of the injection-molded part 16. When the temperature of the injection-molded part 16 changes or is subjected to force, the stress concentration at the contact position between the insert 30 and the injection-molded part 16 can be reduced, thereby improving the structural stability of the injection-molded part 16 and the reliability of the rotor assembly 100.
[0062] In some embodiments of the present invention, the rotor body 10 includes a plurality of inserts 30, which are arranged at intervals along the circumference of the rotor assembly 100, wherein the inserts 30 may be magnetic parts 31, magnets, magnetic tiles, etc. By arranging the inserts 30 at intervals along the circumference of the rotor assembly 100, they can interact with the magnetic field of the stator to achieve conversion of electrical energy.
[0063] Optionally, the rotor body 10 includes an injection molded part 16, an iron core 32 and a plurality of magnetic parts 31, the iron core 32 and the plurality of magnetic parts 31 are mounted on the injection molded part 16, the iron core 32 extends along the circumferential direction of the rotor assembly 100, the plurality of magnetic parts 31 are arranged along the circumferential direction, and the plurality of magnetic parts 31 and the iron core 32 are adjacent in the radial direction of the rotor assembly 100. Among them, the plurality of magnetic parts 31 are arranged along the circumferential direction of the rotor assembly 100, the magnetic field generated by the magnetic parts 31 interacts with the magnetic field in the stator to generate force and torque, thereby causing the rotor to rotate and driving the operation of the motor, the iron core 32 extends along the circumferential direction of the rotor assembly 100, and the plurality of magnetic parts 31 and the iron core 32 are adjacent in the radial direction of the rotor assembly 100, so that the iron core 32 can provide a low magnetic resistance path, so that the magnetic field can be more easily transmitted through the rotor assembly 100, and the magnetic field can more effectively interact with the magnets on the rotor, thereby generating greater force and torque.
[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0067] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A rotor assembly, characterized in that: The rotor assembly includes a rotor body, on which a groove-shaped or hole-shaped correction structure is provided. The correction structure is arranged along the circumference of the rotor body, and a balancing medium can be filled in the correction structure to perform balance correction on the rotor assembly. The minimum distance between the correction structure and the outer periphery of the rotor body is L1, and the distance between the correction structure and the rotation axis of the rotor body is L2. The ratio of L1 to L2, L1 / L2, is less than 1.
2. The rotor assembly according to claim 1, characterized in that: The ratio of L1 to L2, L1 / L2, is not greater than 0.1 and not less than 0.
005.
3. The rotor assembly according to claim 1, characterized in that: The correction structure comprises a plurality of correction holes, which are arranged at intervals along the circumferential direction of the rotor body, and the correction holes can be filled with correction medium.
4. The rotor assembly according to claim 3, characterized in that: The correction hole extends in a direction parallel to the rotation axis of the rotor assembly; and / or the cross-section of the correction hole is configured to be an oblong shape extending along the circumference of the rotor body; and / or the proportion of the plurality of correction holes in the circumferential direction of the rotor body is less than 50%; and / or the plurality of correction holes are evenly spaced along the circumference of the rotor body.
5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The correction structure includes a groove provided on the rotor body, and the groove extends continuously or discontinuously along the circumference of the rotor body.
6. The rotor assembly according to any one of claims 1 to 4, characterized in that: The correction structure is arranged on one side surface of the rotor body along the axial direction. Wherein, the correction structure passes through the rotor body along the axial direction; or the correction structure is spaced apart from the other side surface of the rotor assembly along the axial direction.
7. The rotor assembly according to any one of claims 1 to 4, characterized in that: The rotor body comprises a bottom wall and a peripheral wall, wherein the peripheral wall is connected to the peripheral edge of the bottom wall and extends along the circumference of the bottom wall, and an accommodating space for placing the stator is constructed on the inner side of the peripheral wall. Wherein, the correction structure is opposite to the circumferential wall in the axial direction of the rotor assembly; or, in the projection in the axial direction of the rotor assembly, the correction structure falls between the inner ring and the outer ring of the circumferential wall; or, in the projection in the axial direction of the rotor assembly, the correction structure falls between the inner ring and the outer ring of the circumferential wall and has a gap with the inner ring and the outer ring of the circumferential wall.
8. The rotor assembly according to claim 7, characterized in that: The rotor assembly further includes a rotor shaft connected to the bottom wall and extending along a rotation axis of the rotor assembly.
9. A motor, characterized in that: include: A rotor assembly according to any one of claims 1 to 8; A stator assembly cooperates with the rotor assembly to drive the rotor assembly to rotate.
10. The motor according to claim 9, characterized in that It also includes a correction pin, which is inserted into the correction structure and is relatively stationary with respect to the rotor body; And / or, it also includes balancing mud, and the balancing mud is filled in the correction structure.