Rotor assembly and motor

Abstract

The present invention provides a rotor assembly and a motor. The rotor assembly is used for the motor. Wherein, the rotor assembly includes: a first rotor, the first rotor is provided with a first through hole and at least one first tooth portion, and the first tooth portion protrudes into the first through hole; a second rotor, disposed in the first through hole, there is a gap between the first rotor and the second rotor, the second rotor is provided with at least one groove, and the first tooth portion is disposed in the groove. Taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, on the cross-section, the bottom of the groove is curved; a damping portion, at least part of the damping portion is disposed in the gap. In the rotor assembly provided by the present invention, the bottom of the groove is set to be curved, which is more conducive to dispersing the force exerted by the damping portion on the second rotor, avoiding stress concentration, avoiding cracking of the damping portion, and improving the service life of the damping portion.

Description

Technical Field

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

[0002] In the related art, compared with the traditional non-damping rotor, the damping rubber rotor improves the damping performance and significantly improves the overall noise characteristics of the corresponding whole machine product. However, during the operation of the rotor, due to the action of the outer rotor on the rubber layer, the rubber layer is prone to problems such as cracking.

[0003] Specifically, as Figure 1 shown, the rotor assembly 100' consists of an outer rotor 110', an inner rotor 120', and a rubber layer 130' injection-molded between the outer rotor 110' and the inner rotor 120'. Among them, the groove of the inner rotor 120' and the convex tooth of the outer rotor 110' adopt a corner transition.

[0004] As Figure 2 shown, the surface where the straight line L of the outer rotor 110' is located can transmit a stable and unchanged positive pressure F to the inner rotor 120' k , and the tangential component force F tk is the rotational torque of the inner rotor 120'. However, at the moment of rotation, due to the relatively soft rubber layer 130', there will be a relatively obvious relative sliding between the rotor and the rubber layer at the arc surface C, causing the frictional force f generated by the rubber layer 130' to be consistent with the rotation direction. Then, the stress changes sharply at the corner B. When transmitted to the inner rotor 120', it will also be a locally unstable torque, thereby affecting the stability of the rotor assembly 100' and causing the rubber layer to be prone to cracking.

[0005] As Figure 3 shown, the force at the corner of the rubber layer 130' in the rotor assembly 100' in the related art is the largest, about 0.256 MPa. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0007] To this end, the first aspect of the present invention provides a rotor assembly.

[0008] The second aspect of the present invention provides a motor.

[0009] In view of this, the present invention provides a rotor assembly, comprising: a first rotor provided with a first through hole and at least one first tooth portion protruding into the first through hole; a second rotor disposed in the first through hole, with a gap between the first rotor and the second rotor, the second rotor being provided with at least one groove, and the first tooth portion being disposed in the groove. Taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, the bottom of the groove is curved on the cross-section; a damping portion, at least a part of the damping portion being disposed in the gap.

[0010] In the working process of the rotor assembly provided by the present invention, the rotor assembly is driven by magnetic force to rotate relative to the stator assembly of the motor. The rotor assembly provides an installation position for the second rotor by forming a first through hole in the first rotor, provides an installation position for the damping portion through the gap between the first rotor and the second rotor, and realizes the damping effect on the rotor assembly through the damping portion, thereby reducing the noise generated by the rotor assembly, making the rotor assembly applicable to motors with low-noise requirements, especially applicable to household appliances, capable of meeting the needs of users or manufacturers for low noise, and improving the user experience.

[0011] For the rotor assembly provided by the present invention, a first tooth portion is provided on the inner wall of the first rotor, and a second groove is provided on the second rotor. The first tooth portion is located in the second groove. And taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, the bottom of the groove is set to be curved on the cross-section. Then, when the rotor assembly rotates, the transmission process of the rotational force is that the first rotor is driven by magnetic force, the first rotor drives the damping portion, and the damping portion drives the second rotor. Therefore, since the groove position is a relatively large force application position of the damping portion on the second rotor, setting the bottom of the groove to be curved is more conducive to dispersing the force exerted by the damping portion on the second rotor, avoiding stress concentration, avoiding cracking of the damping portion, and improving the service life of the damping portion.

[0012] Specifically, for the rotor assembly provided by the present invention, the damping portion can be made of a rubber material, and the rubber material can be disposed between the first rotor and the second rotor through an injection molding process.

[0013] In addition, for the rotor assembly according to the above technical solution provided by the present invention, the following additional technical features may further be included:

[0014] In the above technical solution, further, taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, the contour line of the first tooth portion is curved on the cross-section; taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, the shape of the contour line of the groove on the cross-section is the enlarged shape of the contour line of the first tooth portion, wherein the magnification base point is on the center line of the first tooth portion.

[0015] In this technical solution, the first rotor is sectioned in a direction perpendicular to the axis of the first rotor. On the section, the contour line of the first tooth part is set as a curve, so as to disperse the force exerted by the first rotor on the damping part, thereby further avoiding stress concentration, preventing the cracking of the damping part, and improving the service life of the damping part. Moreover, the contour line of the groove is the same as the enlarged shape of the contour line of the first tooth part, and the magnification base point is on the center line of the first tooth part, so that the shape of the groove is more regular. And, the relative position shapes of the contour of the first tooth part and the contour of the groove are the same, but the sizes are different. One end of the first tooth part can be accommodated in the groove, and the thickness of the damping part between the first tooth part and the groove is more uniform, so that the force on the damping part is more uniform, and stress concentration is further avoided.

[0016] In any of the above technical solutions, further, the first tooth part includes: a head, which is arranged opposite to the groove. The first rotor is sectioned in a direction perpendicular to the axis of the first rotor. On the section, the peripheral side of the head is in a curve protruding towards the first through hole; the second rotor is sectioned in a direction perpendicular to the axis of the second rotor. On the section, the shape of the contour line of the groove is the enlarged shape of the contour line of the head, wherein the magnification base point is the center point of the head.

[0017] In this technical solution, the protruding curve can better provide a thrust for the damping part and the second rotor when the rotor assembly rotates. And, since the contour line of the groove is the enlarged shape of the contour line of the head, the groove corresponding to the protruding curve is a concave curve. The concave curve receives the thrust of the protruding curve, and the force-bearing capacity of the concave curve is better. Similarly, the joint surface between the damping part and the head is also in a concave curve shape, so the force-bearing capacity of the damping part is also improved, thereby avoiding the cracking of the damping part. Moreover, the contour line of the groove is the same as the enlarged shape of the contour line of the head, and the magnification base point is the center point of the head, that is, the relative position shapes of the contour of the head and the contour of the groove are the same, but the sizes are different. One end of the head can be accommodated in the groove, and the thickness of the damping part between the head and the groove is more uniform, so that the force on the damping part is more uniform, and stress concentration is further avoided.

[0018] In any of the above technical solutions, further, the first tooth part further includes: a waist, and the head protrudes at the end of the waist. The first rotor is sectioned in a direction perpendicular to the axis of the first rotor. On the section, both sides of the waist are in a curve concave towards the inside of the waist.

[0019] In this technical solution, the first tooth portion has a waist portion and a head portion. And, when the first rotor is sectioned in a direction perpendicular to the axis of the first rotor, on the cross-section, the contour of the waist portion is set as a curve that is concave inward, and the contours of the head portions are all set as curves that are convex outward. Thus, a wavy line structure is formed on the side surface of the entire first tooth portion, which can provide a better binding force between the first rotor and the vibration damping portion. And, when the rotor rotates, the force exerted by the first tooth portion on the vibration damping portion can be further dispersed, further avoiding cracking of the vibration damping portion and improving the service life of the vibration damping portion.

[0020] In any of the above technical solutions, further, when the first rotor is sectioned in a direction perpendicular to the axis of the first rotor, on the cross-section, the width of the head portion is greater than the width of the waist portion.

[0021] In this technical solution, when the first rotor is sectioned in a direction perpendicular to the axis of the first rotor, on the cross-section, the width of the head portion is set to be greater than the width of the waist portion. Thus, when the first rotor drives the vibration damping portion to rotate, a tendency to hold the vibration damping portion tightly is formed, preventing the vibration damping portion from detaching from the first rotor.

[0022] In any of the above technical solutions, further, when the first rotor is sectioned in a direction perpendicular to the axis of the first rotor, on the cross-section, the contour of the head portion can be fitted by multiple arcs; when the second rotor is sectioned in a direction perpendicular to the axis of the second rotor, on the cross-section, the contour of the groove is a proportionally enlarged contour of the head portion, where the base point for enlargement is the center point of the head portion.

[0023] In this technical solution, when the first rotor is sectioned in a direction perpendicular to the axis of the first rotor, on the cross-section, the head portion is set to be fitted by multiple arcs, and the arc structure is used to avoid stress concentration. And, the groove is a proportionally enlarged contour of the head portion, and the base point for enlargement is the center point of the head portion. Thus, the shapes of the head portion and the groove are the same, further ensuring that the thicknesses of all parts of the vibration damping portion between the head portion and the groove are equal, the force on the vibration damping portion is more uniform, and, when starting to rotate, the force exerted by the head portion on the vibration damping portion is transmitted to the second rotor at the same angle and in the same direction. Thus, no force combination occurs within the vibration damping portion, further avoiding stress concentration.

[0024] In any of the above technical solutions, further, the contour of the head portion is an ellipse. Taking the long axis of the head portion as the X-axis and the short axis of the head portion as the Y-axis to establish a coordinate system, within the coordinate system, the points on the contour of the head portion conform to: The points on the contour of the groove conform to: Wherein, X1 is the coordinate of a point on the contour of the head on the X-axis, Y1 is the coordinate of a point on the contour of the head on the Y-axis, X2 is the coordinate of a point on the contour of the groove on the X-axis, Y2 is the coordinate of a point on the contour of the groove on the Y-axis, a is the major axis radius of the head, b is the minor axis radius of the head, n is a positive number, and m is a positive number.

[0025] In this technical solution, the contour of the head is elliptical, and based on the mathematical model of the ellipse, it can be obtained that the points on the contour of the head conform to: And the points on the contour of the groove conform to: That is, the center points of the head and the groove coincide. Moreover, since n is a positive number, it can be understood as the magnification factor of the major axis of the groove relative to the major axis of the head, and since m is a positive number, it can be understood as the magnification factor of the minor axis of the groove relative to the minor axis of the head.

[0026] In any of the above technical solutions, further, the number of the first tooth parts is multiple, and the multiple first tooth parts are centrosymmetrically structured with the axis of the first rotor as the center; or the number of the first tooth parts is multiple, and the multiple first tooth parts are axially symmetrically structured with the diameter of the first rotor as the axis.

[0027] In this technical solution, the number of the first tooth parts is multiple. By arranging the multiple first tooth parts, the overall connection strength of the rotor assembly can be further improved. Moreover, the multiple second tooth parts are centrosymmetrically distributed or axially symmetrically distributed. During the rotation of the rotor assembly, the rotor assembly can be more evenly stressed and rotate more smoothly.

[0028] In any of the above technical solutions, further, part of the damping part is arranged in the gap, and part of the damping part is arranged on the end faces at both ends of the first rotor and the second rotor.

[0029] In this technical solution, the installation position of the damping part is further provided. Part of the damping part is arranged in the gap, and part of the damping part is arranged on the end faces at both ends of the first rotor and the second rotor, so that the damping part can provide damping and buffering effects while also playing a role in fixing the first rotor and the second rotor, further ensuring the concentricity of the second rotor and the first rotor. Moreover, the damping part also forms a surrounding structure for the first rotor and the second rotor, making the connection between the first rotor and the second rotor closer and more stable. And it is also a kind of positioning for the damping part itself, avoiding the displacement of the damping part, so that the rotation of the rotor assembly is more stable.

[0030] In any of the above technical solutions, further, the second rotor further includes: a second through hole penetrating in the axial direction of the second rotor; a positioning notch arranged on the axial end face of the second rotor and located at the edge of the second through hole.

[0031] In this technical solution, the second rotor further includes a second through hole penetrating the axis of the second rotor and a positioning notch provided on the axial end face of the second rotor, which facilitates the installation and positioning of the rotating shaft of the motor.

[0032] In any of the above technical solutions, further, the outer wall of the second rotor is further provided with a second tooth portion, and the second tooth portion is located between two adjacent first tooth portions.

[0033] In this technical solution, a second tooth portion is further provided on the second rotor, and the second tooth portion is located between two adjacent first tooth portions. On the one hand, it increases the contact area between the damping portion and the first rotor and the second rotor, making the setting of the damping portion more stable and further improving the noise reduction effect; on the other hand, since the second tooth portion is provided between two adjacent first tooth portions, during the process of the first rotor driving the second rotor to rotate, part of the damping portion is between the first tooth portion and the second tooth portion, and the first tooth portion and the second tooth portion can clamp the damping portion, avoiding the separation of the damping portion from the first rotor or the second rotor, and avoiding cracking due to the asynchronous rotation of the damping portion and the first rotor or the second rotor, thus ensuring the stability of the operation of the rotor assembly.

[0034] According to the second aspect of the present invention, a motor is provided, including: a stator assembly; and the rotor assembly of any of the above technical solutions, the rotor assembly being rotatable within the stator assembly; and a magnetic member provided on the rotor assembly.

[0035] The motor provided by the present invention includes the rotor assembly of any of the above technical solutions, and thus has all the technical effects of the rotor assembly in any of the above technical solutions.

[0036] Specifically, the magnetic member can be a magnetic tile.

[0037] The additional aspects and advantages of the present invention will become apparent in the following description section or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0039] Figure 1 is a schematic structural diagram of a rotor assembly in the related art;

[0040] Figure 2 is a force analysis diagram of the rubber layer in the rotor assembly in the related art;

[0041] Figure 3 is a simulation analysis of the force on the rubber layer in the rotor assembly in the related art;

[0042] Figure 4It is a schematic structural diagram of a rotor assembly provided by an embodiment of the present invention;

[0043] Figure 5 It is a cross-sectional view of a rotor assembly provided by an embodiment of the present invention at an angle;

[0044] Figure 6 It is another cross-sectional view of a rotor assembly provided by an embodiment of the present invention;

[0045] Figure 7 It is a schematic structural diagram of a first rotor in a rotor assembly provided by an embodiment of the present invention;

[0046] Figure 8 It is a schematic structural diagram of a second rotor of a rotor assembly provided by an embodiment of the present invention;

[0047] Figure 9 It is another cross-sectional view of a rotor assembly provided by an embodiment of the present invention;

[0048] Figure 10 It is a force analysis diagram of a damping part in a rotor assembly provided by an embodiment of the present invention;

[0049] Figure 11 It is a simulation analysis of a damping part in a rotor assembly provided by an embodiment of the present invention;

[0050] Figure 12 It is a schematic diagram of establishing a coordinate system with the major axis and minor axis of the head in a rotor assembly provided by an embodiment of the present invention.

[0051] Among them, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names in the figure is:

[0052] 100' Rotor assembly, 110' Outer rotor, 120' Inner rotor, 130' Rubber layer.

[0053] Among them, Figures 4 to 12 The corresponding relationship between the reference numerals and the component names in the figure is:

[0054] 100 Rotor assembly, 110 First rotor, 112 First through hole, 114 First tooth part, 1142 Waist part, 1144 Head part, 116 Notch, 118 Groove, 120 Second rotor, 122 Second tooth part, 124 Second through hole, 126 Positioning notch, 130 Damping part. Detailed implementation manners

[0055] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0056] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0057] Reference will now be made to Figures 4 to 12 describe a rotor assembly 100 and an electric motor provided according to some embodiments of the present invention.

[0058] Embodiment 1

[0059] As Figures 4 to 11 shown, an embodiment of the present invention provides a rotor assembly 100, comprising: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0060] Wherein, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is disposed on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110, and a part of the vibration damping portion is disposed between the first rotor 110 and the second rotor 120 to fill the gap.

[0061] In the working process of the rotor assembly 100 provided by the present invention, the rotor assembly 100 is driven by magnetic force to rotate relative to the stator assembly of the electric motor. The first tooth portion 114 on the first rotor 110 is installed in the groove 118 of the second rotor 120, and the vibration damping portion is used to fill the gap between the first rotor 110 and the second rotor 120, thereby forming a vibration damping structure of the rotor assembly 100, and further reducing the noise generated by the rotor assembly 100, so that the rotor assembly 100 is applicable to electric motors with low noise requirements, especially applicable to household electrical appliances, and can meet the requirements of users or manufacturers for low noise, and can improve the user experience.

[0062] The rotor assembly 100 provided by the present invention is provided with at least one first tooth portion 114 on the first rotor 110, and at least one groove 118 is provided on the outer wall of the second rotor 120. The first tooth portion 114 is located in the groove 118, and the damping portion is filled between the first rotor 110 and the second rotor 120, that is, there is also a damping portion in the first tooth portion 114 and the groove 118. Further, when the rotor starts to rotate, the initial power of the first tooth portion 114 will apply a force to the damping portion, and the damping portion will transmit the power to the groove 118 of the second tooth portion 122. Therefore, the bottom of the groove 118 is set to be curved, which can disperse the force of the damping portion on the second rotor 120, and the reaction force of the second rotor 120 on the damping portion will also be relatively dispersed, avoiding tensile stress concentration and cracking of the damping portion caused by stress concentration, and improving the service life of the damping portion.

[0063] Specifically, for the rotor assembly 100 provided by the present invention, the damping portion can be made of rubber material, and the rubber material can be set between the first rotor 110 and the second rotor 120 through an injection molding process.

[0064] Further, the bottom of the groove 118 can be arc-shaped.

[0065] Embodiment 2

[0066] As Figure 5 、 Figure 7 、 Figure 8 And Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a damping portion.

[0067] Wherein, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is arranged on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110, and a part of the damping portion is arranged between the first rotor 110 and the second rotor 120 to fill the gap.

[0068] Further, the first rotor 110 is sectioned in a direction perpendicular to the axis of the first rotor 110. On the section, the contour line of the first tooth portion 114 is curved. And, the second rotor 120 is sectioned in a direction perpendicular to the axis of the second rotor 120. On the section, the shape of the contour line of the groove 118 is an enlarged shape of the contour line of the first tooth portion 114, wherein the magnification base point is on the center line of the first tooth portion 114.

[0069] That is, on the basis of the first embodiment, not only the bottom of the groove 118 is curved, but also the contour of the first tooth portion 114 is curved. Moreover, the shape of the contour line of the groove 118 is the same as the enlarged shape of the contour line of the first tooth portion 114, and the base point for enlargement is on the center line of the first tooth portion 114. Furthermore, the shape of the groove 118 becomes more regular, that is, the relative position shapes of the contour of the first tooth portion 114 and the contour of the groove 118 are the same, but the sizes are different. One end of the first tooth portion 114 can be accommodated in the groove 118, and the thickness of the damping portion 130 located between the first tooth portion 114 and the groove 118 is more uniform, so that the force on the damping portion 130 is more evenly distributed, further avoiding stress concentration. Therefore, when the first rotor 110 is sectioned in a direction perpendicular to the axis of the first rotor 110, on the cross-section, the damping portion in the area of the first tooth portion 114 and the groove 118 is also curved.

[0070] Therefore, the force exerted by the first tooth portion 114 on the damping portion will be dispersed, and the force exerted by the damping portion on the second rotor 120 will also be dispersed, thus greatly reducing stress concentration and further avoiding cracking of the damping portion and extending the service life of the damping portion.

[0071] Embodiment Three

[0072] As Figure 5 、 Figure 7 、 Figure 9 And Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a damping portion.

[0073] Wherein, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is arranged on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the damping portion is arranged between the first rotor 110 and the second rotor 120 to fill the gap.

[0074] Furthermore, the first tooth portion 114 includes: a head 1144. The head 1144 is arranged opposite to the groove 118. When the first rotor 110 is sectioned in a direction perpendicular to the axis of the first rotor 110, on the cross-section, the peripheral side of the head 1144 is curved and protrudes towards the first through hole 112.

[0075] Furthermore, when the second rotor 120 is sectioned in a direction perpendicular to the axis of the second rotor 120, on the cross-section, the shape of the contour line of the groove 118 is the enlarged shape of the contour line of the head 1144, wherein the base point for enlargement is the center point of the head 1144.

[0076] On the basis of the second embodiment, the convex curved head pushes the concave damping portion 130, and then the convex damping portion 130 pushes the groove 118 of the second rotor 120. The force applied by the convex curve can be more easily dispersed by the concave curve, thereby enhancing the force-bearing capacity of the damping portion 130 and the second rotor 120, and avoiding cracking of the damping portion 130.

[0077] Moreover, when the rotor assembly 100 rotates, the convex curved head 1144 pushes the vibration portion, further dispersing the force applied by the first rotor 110 to the vibration portion. And the entire head 1144 has a curved structure, and can disperse the force applied by the first rotor 110 to the vibration portion during both forward and reverse rotations.

[0078] In addition, the contour of the groove 188 is obtained by magnifying the contour of the head 1144 with the center point of the head 1144 as the magnification base point. The contour line of the groove 118 is the same as the magnified shape of the contour line of the head 1144, that is, the relative position shapes of the contour of the head and the contour of the groove are the same, but the sizes are different. One end of the head can be accommodated in the groove. Since the contour line of the groove 118 is the magnified shape of the contour line of the head 1144, the groove 118 corresponding to the convex curve is a concave curve, thereby making the thickness of the damping portion between the head and the groove more uniform, making the force on the damping portion more evenly distributed, and further avoiding stress concentration.

[0079] Specifically, the circumferential side of the head 1144 is in an arc shape protruding towards the first through hole 112.

[0080] Embodiment Four

[0081] As Figure 5 、 Figure 7 、 Figure 9 And Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a damping portion 130.

[0082] Wherein, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is provided on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, and the number of grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the damping portion is provided between the first rotor 110 and the second rotor 120 to fill the gap.

[0083] On the basis of the second embodiment, the first tooth portion 114 includes: a head and a waist. The head is provided on the waist. The first rotor 110 is sectioned in a direction perpendicular to the axis of the first rotor 110. In the cross-section, both sides of the waist 1142 are curved and recessed into the waist 1142.

[0084] Furthermore, when the rotor assembly 100 rotates, the curved waist 1142 in the recessed state pushes the vibration portion, dispersing the force exerted by the first rotor 110 on the vibration portion. Moreover, the double-sided curved waist 1142 can disperse the force exerted by the first rotor 110 on the vibration portion both during forward rotation and reverse rotation.

[0085] The first rotor 110 is sectioned in a direction perpendicular to the axis of the first rotor 110. In the cross-section, the peripheral side of the head 1144 is curved and protrudes toward the first through-hole 112.

[0086] Furthermore, when the rotor assembly 100 rotates, the curved head 1144 in the protruding state pushes the vibration portion, further dispersing the force exerted by the first rotor 110 on the vibration portion. Moreover, the entire head 1144 has an arc-shaped structure and can disperse the force exerted by the first rotor 110 on the vibration portion both during forward rotation and reverse rotation.

[0087] Moreover, the recessed curved waist 1142 and the protruding curved head 1144, that is, the single-sided first tooth portion, form a wavy line. The wavy line can increase the contact area between the first tooth portion 114 and the vibration damping portion, thereby increasing the bonding force between the two, avoiding relative sliding between the vibration damping portion and the first rotor 110, and ensuring the stability of the rotor assembly 100.

[0088] Specifically, both sides of the waist 1142 are arc-shaped and recessed into the waist 1142.

[0089] Embodiment Five

[0090] As Figure 5 、 Figure 7 、 Figure 9 And Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0091] Wherein, the first rotor 110 is provided with a first through-hole 112 and at least one first tooth portion 114. The first tooth portion 114 is provided on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118. The number of grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the vibration damping portion is provided between the first rotor 110 and the second rotor 120 to fill the gap.

[0092] Further, the first rotor 110 is sectioned in a direction perpendicular to the axis thereof. On the section, the width of the head 1144 is greater than the width of the waist 1142.

[0093] Furthermore, based on any one of Embodiments 1 to 4, the first tooth portion 114 is shaped such that the head 1144 is large and the waist 1142 is small. Thus, during rotation, the entire first tooth portion 114 will be in a gripping state, thereby holding the damping portion and preventing the damping portion from sliding relative to the first rotor 110.

[0094] Embodiment 6

[0095] As Figure 5 、 Figure 7 、 Figure 9 and Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a damping portion.

[0096] Wherein, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is disposed on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, the number of grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the damping portion is disposed between the first rotor 110 and the second rotor 120 to fill the gap.

[0097] Further, the first rotor 110 is sectioned in a direction perpendicular to the axis thereof. On the section, the contour of the head 1144 can be fitted by multiple arcs.

[0098] Further, the second rotor 120 is sectioned in a direction perpendicular to the axis thereof. On the section, the contour of the groove 118 is a proportionally enlarged contour of the head 1144, wherein the base point of the enlargement is the center point of the head 1144.

[0099] Furthermore, based on any one of Embodiments 1 to 5, the first rotor 110 is sectioned in a direction perpendicular to the axis thereof. On the section, the head 1144 is set to be fitted by multiple arcs, and the arc structure is used to avoid stress concentration.

[0100] Moreover, the contour of the groove 118 is obtained by proportionally enlarging the contour of the head 1144 with the center point of the head 1144 as the magnifying base point. As a result, the head 1144 and the groove 118 have the same shape, further ensuring that the thickness of each part of the damping portion 130 between the head 1144 and the groove 118 is equal, and the force on the damping portion 130 is more uniform. Also, when starting rotation, the force exerted by the head 1144 on the damping portion 130 is transmitted to the second rotor 120 at the same angle and in the same direction, thus preventing the combination of forces within the damping portion 130, further avoiding stress concentration, and enhancing the service life of the damping portion 130.

[0101] Specifically, the contour of the head 1144 is fitted by multiple arcs, and correspondingly, the contour of the groove 118 is also fitted by multiple arcs. Moreover, the contour line of the groove 118 is obtained by enlarging the contour line of the head 1144. Therefore, the arcs on the corresponding head 1144 and groove 118 are concentrically arranged.

[0102] More specifically, the first rotor 110 is sectioned in a direction perpendicular to its axis. On the cross-section, the head 1144 is elliptical, and the minor axis of the head 1144 is arranged along the radial direction of the first rotor 110.

[0103] The second rotor 120 is sectioned in a direction perpendicular to its axis. On the cross-section, the groove 118 is partially elliptical, the minor axis of the groove 118 is arranged along the radial direction of the second rotor 120, and the center of the groove 118 is the same as that of the head 1144.

[0104] Furthermore, while ensuring the diameter of the rotor assembly 100, the contact area between the head 1144 of the first tooth portion 114 and the damping portion is increased. As a result, when rotating, the force exerted by the first rotor 110 on the damping portion is reduced, further preventing the cracking of the damping portion and enhancing the service life of the damping portion.

[0105] Also, specifically, the exposed surface of the head is a part of an ellipse. The groove 118 has the same shape as the head 1144, both being parts of an ellipse, and they are concentrically arranged. When starting rotation, the force exerted by the head 1144 on the damping portion 130 is transmitted to the second rotor 120 at the same angle and in the same direction, thus preventing the combination of forces within the damping portion 130 and avoiding stress concentration.

[0106] Of course, in other embodiments of the present application, the shape of the contour of the head 1144 is not limited to an ellipse, and it can also be a circle or a regular or irregular figure composed of multiple curves, such as a wavy shape or other shapes.

[0107] Embodiment Seven

[0108] As Figure 5 、 Figure 7 、 Figure 9 and Figure 10 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0109] Wherein, the first rotor 110 is provided with a first through hole 112 and a plurality of first tooth portions 114, and the first tooth portions 114 are disposed on the inner wall of the first rotor 110; the second rotor 120 is provided with a plurality of grooves 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110, and a part of the vibration damping portion is disposed between the first rotor 110 and the second rotor 120 to fill the gap.

[0110] Furthermore, the plurality of first tooth portions 114 are of a centrosymmetric structure, and the center of symmetry is the axis of the first rotor 110.

[0111] Furthermore, based on any one of Embodiments 1 to 6, when the rotor assembly 100 rotates, the plurality of first tooth portions 114 can simultaneously push the vibration damping portion, so that the force applied by each first tooth portion 114 to the vibration damping portion is reduced, and the force on the entire vibration damping portion is more evenly distributed, ensuring that the rotation of the rotor assembly 100 is smoother, and further reducing the noise of the rotor assembly 100.

[0112] Alternatively, the plurality of first tooth portions 114 are of an axisymmetric structure, and the axis of symmetry is a certain diameter of the first rotor 110.

[0113] Furthermore, based on any one of Embodiments 1 to 6, when the rotor assembly 100 rotates, the plurality of first tooth portions 114 can simultaneously push the vibration damping portion, so that the force applied by each first tooth portion 114 to the vibration damping portion is reduced, and the force on the entire vibration damping portion is more evenly distributed, ensuring that the rotation of the rotor assembly 100 is smoother, and further reducing the noise of the rotor assembly 100.

[0114] Embodiment 8

[0115] As Figure 5 、 Figure 7 and Figure 9 shown, an embodiment of the present invention provides a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0116] Among them, the first rotor 110 is provided with a first through hole 112 and a plurality of first tooth portions 114, and the first tooth portions 114 are arranged on the inner wall of the first rotor 110; the second rotor 120 is provided with a plurality of grooves 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the vibration damping portion is arranged between the first rotor 110 and the second rotor 120 to fill the gap, and the other part is arranged on the end faces of both ends of the first rotor 110 and the second rotor 120.

[0117] Furthermore, on the basis of any one of Embodiments 1 to 7, the vibration damping portion forms a surrounding state for the first rotor 110 and the second rotor 120, so that the connection between the first rotor 110, the second rotor 120 and the vibration damping portion is tighter. Furthermore, when the rotor assembly 100 rotates, the rotation effect is more stable and the noise reduction effect is better.

[0118] Embodiment 9

[0119] As Figure 6 shown in Figure 8 A rotor assembly 100 according to an embodiment of the present invention includes: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0120] Among them, the first rotor 110 is provided with a first through hole 112 and a plurality of first tooth portions 114, and the first tooth portions 114 are arranged on the inner wall of the first rotor 110; the second rotor 120 includes a second through hole 124 and a positioning notch 126, and at least one groove 118 is further arranged on the outer wall of the second rotor 120. The number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110. A part of the vibration damping portion is arranged between the first rotor 110 and the second rotor 120 to fill the gap, and the other part is arranged on the end faces of both ends of the first rotor 110 and the second rotor 120.

[0121] Furthermore, on the basis of any one of Embodiments 1 to 8, the second rotor 120 further includes a second through hole 124 penetrating the axis of the second rotor 120 and a positioning notch 126 arranged on the axial end face of the second rotor 120, which is convenient for the installation and positioning of the rotating shaft of the motor.

[0122] Embodiment 10

[0123] As Figure 5 shown in Figure 8 and Figure 9 A rotor assembly 100 according to an embodiment of the present invention includes: a first rotor 110, a second rotor 120, and a vibration damping portion.

[0124] Among them, the first rotor 110 is provided with a first through hole 112 and at least one first tooth part 114, and the first tooth part 114 is arranged on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118 and at least one second tooth part 122. The number of the grooves 118 is the same as that of the first tooth parts 114, that is, one first tooth part 114 is located in one groove 118, and one second tooth part 122 is arranged between two adjacent first tooth parts 114. A gap is formed between the second rotor 120 and the first rotor 110, and a part of the vibration damping part is arranged between the first rotor 110 and the second rotor 120 to fill the gap.

[0125] Furthermore, on the basis of any one of the first embodiment to the ninth embodiment, a second tooth part 122 is arranged on the second rotor 120, and the second tooth part 122 is located between two adjacent first tooth parts 114. Furthermore, the contact area between the vibration damping part and the second rotor 120 is increased, the bonding force between the vibration damping part and the second rotor 120 is ensured, and the rotation stability of the rotor assembly 100 is improved.

[0126] Further, the second tooth parts 122 are arranged alternately. Specifically, the number of the first tooth parts 114 can be two, and the number of the second tooth parts 122 can be two. Of course, in other embodiments of the present invention, the number of the first tooth parts 114 and the second tooth parts 122 can be other numbers, such as: one, three, four, five, etc.

[0127] Embodiment Eleven

[0128] As Figure 4 shown in Figure 11 the rotor assembly 100 proposed by the present invention has a first rotor 110 and a second rotor 120 that are mutually inlaid and staggered, and a vibration damping part that fills the gap between the first rotor 110 and the second rotor 120.

[0129] Specifically, the second tooth part 122 includes a second tooth part 122 and a groove 118 with an arc surface; the first rotor 110 includes a first tooth part 114 and an arc-shaped structure at the top of the first tooth part 114.

[0130] The vibration damping part is formed by filling in the gap between the first rotor 110 and the second rotor 120. Specifically, the end of the first tooth part 114 is arranged in the groove 118, and then rubber is integrally filled and injection-molded to form a rubber vibration damping part.

[0131] Specifically, as Figure 10 shown in i, a positive pressure F is then generated on the curved groove 118 of the second rotor 120 that maintains static inertia j , F j 's tangential component force F tj is the rotational torque of the second rotor 120. The tangential component force F tj increases with the increase of the angle β on the curved groove 118. Since the curvature change of the curve is stable, the tangential component force F tj increases steadily with the increase of ∠β, that is, the rotational torque of the second rotor 120 changes stably on the curved groove 118. This further makes the transmitted torque more uniform and reduces the cracking probability of the damping part.

[0132] As Figure 11 shown, through simulation analysis, when the same torque is applied to the first rotor 110 and the second rotor 120 is fixed (simulating the instant of startup), and the rubber is analyzed, the maximum stress received by the damping part in the rotor assembly 100 provided by the present invention is about 0.15103 MPa, at the corner of the groove 118 (the long axis end of the elliptical head 1144 of the first tooth part 114). And as Figure 3 shown, the maximum stress received by the common corner structure in the prior art is about 0.25625 MPa. And, as Figure 3 and Figure 11 shown, at other positions of the rotor assembly 100 in the present invention except the maximum stress point, the stress at multiple places is lower than 0.05 MPa, while in the rotor assembly of the related technology, the stress at multiple places is higher than 0.05 MPa. Obviously, both the average value and the maximum value of the force received by the damping part in the present invention are much lower than the force received by the rubber layer in the related technology.

[0133] Obviously, the curved structure of the present application is better than the corner transition structure. The rotational torque received by the second rotor 120 changes evenly on the surface of the curved groove 118, directly making the rotation of the rotor assembly 100 stable, and having a good improvement effect on reducing the rotation noise of the rotor assembly 100. In addition, the stress generated on the injection-molded rubber is small, which can improve the service life of the rotor.

[0134] Embodiment Twelve

[0135] As Figure 6 shown, an embodiment of the present invention proposes a rotor assembly 100, including: a first rotor 110, a second rotor 120, and a damping part.

[0136] Among them, the first rotor 110 is provided with a first through hole 112 and at least one first tooth portion 114, and the first tooth portion 114 is arranged on the inner wall of the first rotor 110; the second rotor 120 is provided with at least one groove 118, and the number of the grooves 118 is the same as that of the first tooth portions 114, that is, one first tooth portion 114 is located in one groove 118, and a gap is formed between the second rotor 120 and the first rotor 110, and a part of the vibration damping portion is arranged between the first rotor 110 and the second rotor 120 to fill the gap.

[0137] Furthermore, a notch 116 is further arranged on the first tooth portion 114, at one end of the first tooth portion 114 facing the second rotor 120, and along the axis direction of the first rotor 110, the notch 116 is located at least at one of the upper part, middle part and lower part of the first rotor 110.

[0138] On the basis of any one of the first to eleventh embodiments, a notch 116 is further arranged on the first tooth portion 114, the notch 116 can communicate with the gap between the first rotor 110 and the second rotor 120 directly, and the vibration damping portion 130 can be arranged in the notch 116, which can improve the bonding force between the vibration damping portion 130 and the first rotor 110 and prevent the first rotor 110 from separating from the vibration damping portion 130.

[0139] Embodiment Thirteen

[0140] As Figure 12 shown, on the basis of the first to twelfth embodiments, further, the contour of the head 1144 is oval. Taking the long axis of the head 1144 as the X-axis and the short axis of the head 1144 as the Y-axis to establish a coordinate system, within the coordinate system, the point β(X1, Y1) on the contour of the head 1144 satisfies: The point α(X2, Y2) on the contour of the groove 118 satisfies: Wherein, X1 is the coordinate of the point on the contour of the head 1144 on the X-axis, Y1 is the coordinate of the point on the contour of the head 1144 on the Y-axis, X2 is the coordinate of the point on the contour of the groove 118 on the X-axis, Y2 is the coordinate of the point on the contour of the groove 118 on the Y-axis, a is the major axis radius of the head 1144, b is the minor axis radius of the head 1144, n is a positive number, and m is a positive number.

[0141] In this embodiment, the contour of the head 1144 is oval, and based on the mathematical model of the oval, it can be obtained that the points on the contour of the head 1144 satisfy: And the points on the contour of the groove 118 satisfy: That is, the center point of the head 1144 coincides with the center point of the groove 118. And, n is a positive number, which can be understood as the magnification factor of the major axis of the groove 118 relative to the major axis of the head 1144, that is, the major axis of the groove 118 is magnified by n times relative to the major axis of the head 1144. m is a positive number, which can be understood as the magnification factor of the minor axis of the groove 118 relative to the minor axis of the head 1144, that is, the minor axis of the groove 118 is magnified by m times relative to the minor axis of the head 1144.

[0142] Those skilled in the art can set the values of n and m according to the required volume of the rotor assembly 100, etc. And, n and m can be the same or different.

[0143] Specifically, the contour of the groove 118 is obtained by magnifying the contour of the head 1144 with the center point of the head as the magnification base point. Furthermore, the contour of the groove 118 is also a part of an ellipse. Therefore, the major axis of the groove 118 also coincides with the X-axis of the coordinate system, and the minor axis of the groove 118 also coincides with the Y-axis of the coordinate system. Therefore, according to the standard formula of the ellipse, the positions of each point of the groove 118 and the head 1144 can be determined. That is, the points on the contour of the head 1144 conform to: Specifically, And the points on the contour of the groove 118 conform to: Furthermore, it ensures a uniform transition of the distance between the head 1144 and the groove 118 at each position, and when n is equal to m, it ensures that the thickness of the damping part 130 is equal.

[0144] Embodiment Fourteen

[0145] An embodiment of the present invention provides a motor, including: a stator assembly; and the rotor assembly 100 of any of the above embodiments, the rotor assembly 100 can rotate within the stator assembly; a magnetic member, provided on the rotor assembly 100.

[0146] The motor provided by the present invention includes the rotor assembly 100 of any of the above embodiments, and thus has all the technical effects of the rotor assembly 100 in any of the above technical solutions.

[0147] Specifically, the magnetic member can be a magnetic tile.

[0148] In the present invention, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0149] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0150] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0151] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that, Comprising: A first rotor, the first rotor being provided with a first through hole and at least one first tooth portion, the first tooth portion protruding into the first through hole; A second rotor, disposed in the first through hole, a gap being provided between the first rotor and the second rotor, the second rotor being provided with at least one groove, the first tooth portion being disposed in the groove, taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, on the cross-section, the bottom of the groove is curved; A damping portion, at least a part of the damping portion being disposed in the gap; The first tooth portion includes: A head, disposed opposite to the groove, taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, on the cross-section, the peripheral side of the head is curved and protrudes into the first through hole; Taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, on the cross-section, the shape of the contour line of the groove is the shape of the contour line of the head after being enlarged, wherein, the enlargement base point is the center point of the head; The peripheral side of the head is arc-shaped and protrudes into the first through hole.

2. The rotor assembly according to claim 1, wherein, Taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, on the cross-section, the contour line of the first tooth portion is curved; Taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, on the cross-section, the shape of the contour line of the groove is the shape of the contour line of the first tooth portion after being enlarged, wherein, the enlargement base point is on the center line of the first tooth portion.

3. The rotor assembly according to claim 2, wherein, The first tooth portion further includes: A waist portion, the head protruding at the end of the waist portion, taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, on the cross-section, both sides of the waist portion are curved and concave into the waist portion.

4. The rotor assembly according to claim 3, wherein, Taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, on the cross-section, the width of the head is greater than the width of the waist portion.

5. The rotor assembly according to claim 2, wherein, Taking a cross-section of the first rotor in a direction perpendicular to the axis of the first rotor, on the cross-section, the contour of the head can be fitted by multiple arcs; Taking a cross-section of the second rotor in a direction perpendicular to the axis of the second rotor, on the cross-section, the contour of the groove is a proportional enlargement of the contour of the head, wherein, the enlargement base point is the center point of the head.

6. The rotor assembly according to any one of claims 1 to 5, wherein, The contour of the head is oval. Taking the long axis of the head as the X-axis and the short axis of the head as the Y-axis to establish a coordinate system. In this coordinate system, the points on the contour of the head satisfy: The points on the contour of the groove comply with: Wherein, X1 is the coordinate of a point on the contour of the head on the X-axis, Y1 is the coordinate of a point on the contour of the head on the Y-axis, X2 is the coordinate of a point on the contour of the groove on the X-axis, Y2 is the coordinate of a point on the contour of the groove on the Y-axis, a is the major axis radius of the head, b is the minor axis radius of the head, n is a positive number, and m is a positive number.

7. The rotor assembly according to any one of claims 1 to 5, wherein, The number of the first tooth parts is multiple, and the multiple first tooth parts are centrosymmetrically structured with the axis of the first rotor as the center; or The number of the first tooth parts is multiple, and the multiple first tooth parts are axially symmetrically structured with the diameter of the first rotor as the axis.

8. The rotor assembly according to any one of claims 1 to 5, characterized in that Part of the damping part is arranged in the gap, and part of the damping part is arranged on the end faces at both ends of the first rotor and the second rotor.

9. The rotor assembly according to any one of claims 1 to 5, characterized in that, Therefore, the second rotor further includes:[[]] A second through hole that penetrates in the axial direction of the second rotor; A positioning notch is arranged on the axial end face of the second rotor and is located at the edge of the second through hole.

10. The rotor assembly according to any one of claims 1 to 5, characterized in that A second tooth part is further arranged on the outer wall of the second rotor, and the second tooth part is located between two adjacent first tooth parts.

11. A motor, characterized in that, Comprising: A stator assembly; And The rotor assembly according to any one of claims 1 to 10, wherein the rotor assembly is rotatable within the stator assembly; A magnetic member is arranged on the rotor assembly.

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