Motor rotor and motor with same

Abstract

The utility model discloses a motor rotor and a motor with the same. The motor rotor comprises a rotor iron core and a balance assembly, the balance assembly comprises a base body and balance elements, the base body is connected with the rotor iron core, the base body is limited to move in the radial direction or the axial direction or the circumferential direction of the rotor iron core, the base body is provided with a plurality of containing cavities used for containing the balance elements, and the balance elements are arranged in the containing cavities. And the balancing element is accommodated in at least part of the accommodating cavity. According to the motor rotor provided by the embodiment of the utility model, the balance elements are arranged in part of the accommodating cavities during dynamic balance adjustment of the rotor, so that the rotor stably rotates, the dynamic balance adjustment of the rotor is realized in a weight increasing manner, and the stability of the rotor is improved. And meanwhile, by limiting the radial or axial or circumferential movement of the balance assembly in the rotor iron core, the positioning between the balance assembly and the rotor iron core is facilitated, and the stability of the connection structure between the dynamic balance assembly and the rotor iron core is improved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a motor rotor and a motor having the same rotor. Background Technology

[0002] The motor rotor consists of a rotor core and magnets fixed on the rotor core. When the mass distribution of the motor rotor is uneven, it will lead to poor dynamic balance performance, which will affect the service life and efficiency of the motor.

[0003] In related technologies, the mass distribution of a rotating body is altered by removing or adding weight, thereby reducing the dynamic load during rotation. For example, for permanent magnet synchronous motor rotors, dynamic balancing is achieved by adding weight using balancing mud. However, due to oil compatibility issues, the balancing mud cannot meet the requirements for oil immersion in the rotor. Removing weight often involves adding metal balance plates (aluminum alloy, iron, or copper, etc.) beforehand, and then machining the balance plate material to achieve balance when dynamic imbalance occurs. However, metal balance plates are often quite heavy, increasing the overall rotor's moment of inertia. Due to the performance requirements of the motor rotor itself, setting up a dynamic balancing structure is difficult and results in poor stability. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose a motor rotor that achieves dynamic balance adjustment and good stability through weight increase.

[0006] An embodiment of this utility model also proposes an electric motor.

[0007] The motor rotor of this utility model embodiment includes:

[0008] Rotor core;

[0009] A balancing assembly comprising a base and balancing elements, the base being connected to the rotor core and the base being restricted to move radially, axially, or circumferentially along the rotor core, the base having a plurality of cavities for accommodating the balancing elements, at least a portion of the cavities containing the balancing elements.

[0010] In this embodiment of the invention, the motor rotor achieves dynamic balancing by placing balancing elements within a portion of the cavity, enabling smooth rotor rotation. This is accomplished through weight-addition, thereby improving rotor stability. Furthermore, by restricting the radial, axial, or circumferential movement of the balancing assembly within the rotor core, the positioning between the balancing assembly and the rotor core is facilitated, enhancing the stability of the connection structure between them.

[0011] In some embodiments, the substrate is located at at least one end of the rotor core along its axial direction, and a plurality of the cavities are circumferentially distributed on the substrate around the axis of the rotor core.

[0012] In some embodiments, the cavity is a spherical cavity;

[0013] Alternatively, the cavity may be a columnar hole, which is arranged on the axial end face of the substrate, and the axis of the columnar hole is parallel to the axis of the rotor core.

[0014] Alternatively, the cavity may be a columnar hole, which is arranged on the circumferential outer edge of the substrate, and the axis of the columnar hole is orthogonal to the axis of the rotor core.

[0015] Alternatively, the cavity may be a strip-shaped groove arranged on the axial end face of the substrate, with the length direction of the strip-shaped groove being orthogonal to the axial direction of the rotor core.

[0016] In some embodiments, the substrate has a first limiting portion and the rotor core has a second limiting portion, wherein one of the first limiting portion and the second limiting portion is a limiting post and the other is a limiting groove, and the limiting post and the limiting groove are matched and inserted to restrict the balancing assembly from moving radially or circumferentially along the rotor core.

[0017] In some embodiments, an outer housing is also included, which covers the outside of the rotor core and the balancing assembly to restrict radial movement of the balancing assembly along the rotor core.

[0018] In some embodiments, one axial end of the housing has an end plate, the other end of the housing is open, the rotor core and the balancing assembly are placed in the inner cavity of the housing from the open end of the housing, and the open end of the housing is riveted to fix the rotor core and the balancing assembly;

[0019] And / or, the outer casing covers the outside of the cavity to prevent the balancing element from dislodging from the cavity.

[0020] In some embodiments, the substrate is fixed to the rotor core by adhesive bonding, potting, or plastic coating;

[0021] And / or, the balancing element is a balancing ball or a balancing block, and the balancing element is press-fitted onto the base.

[0022] In some embodiments, the rotor core further includes a magnet, wherein the rotor core has a slot and the magnet is embedded in the slot of the rotor core;

[0023] The magnet is a straight magnet, or multiple magnets are arranged radially inside the rotor core.

[0024] In some embodiments, the rotor core may further include a magnet, which is attached to the circumferential wall surface of the rotor core.

[0025] In some embodiments, the substrate includes a plate body and a plurality of arms, the plurality of arms being evenly distributed circumferentially along the plate body and extending axially along the rotor core, the plate body being disposed at one end of the rotor core, the arms being disposed between at least partially adjacent magnets, the cavities being distributed on the plate body and / or the arms, and the cavities located on the arms being evenly distributed at intervals along the length direction of the arms.

[0026] The motor of this utility model embodiment includes a rotating shaft and a rotor, wherein the rotor is the motor rotor described in any of the above embodiments, and the rotor is disposed on the rotating shaft. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of the motor rotor according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the base of the motor rotor in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the base of the motor rotor according to another embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the base of the motor rotor in another embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the base of the motor rotor in another embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the rotor core in the motor rotor of this utility model embodiment.

[0033] Figure 7 This is a schematic diagram of the rotor core in a motor rotor according to another embodiment of the present invention.

[0034] Figure 8 This is a three-dimensional schematic diagram of the motor rotor in Embodiment 1 of this utility model.

[0035] Figure 9 This is a cross-sectional schematic diagram of the motor rotor in Embodiment 1 of this utility model.

[0036] Figure 10 This is a cross-sectional view of the motor rotor from another perspective in Embodiment 1 of this utility model.

[0037] Figure 11 This is a three-dimensional schematic diagram of the motor rotor in Embodiment 2 of this utility model.

[0038] Figure 12 This is a cross-sectional schematic diagram of the motor rotor in Embodiment 2 of this utility model.

[0039] Figure 13 This is a cross-sectional view of the motor rotor from another perspective in Embodiment 2 of this utility model.

[0040] Figure 14 This is a three-dimensional schematic diagram of the motor rotor in Embodiment 3 of this utility model.

[0041] Figure 15 This is a cross-sectional schematic diagram of the motor rotor in Embodiment 3 of this utility model.

[0042] Figure 16 This is a cross-sectional view of the motor rotor from another perspective in Embodiment 3 of this utility model.

[0043] Figure 17 This is a three-dimensional schematic diagram of the motor rotor in Embodiment 4 of this utility model.

[0044] Figure 18 This is a cross-sectional schematic diagram of the motor rotor in Embodiment 4 of this utility model.

[0045] Figure 19 This is a cross-sectional view of the motor rotor from another perspective in Embodiment 4 of this utility model.

[0046] Figure 20 This is one of the schematic diagrams of the motor rotor in Embodiment 5 of this utility model.

[0047] Figure 21 This is the second schematic diagram of the motor rotor in Embodiment 5 of this utility model.

[0048] Figure 22 This is a three-dimensional schematic diagram of the motor rotor in Embodiment Six of this utility model.

[0049] Figure 23 This is a three-dimensional schematic diagram of the motor rotor (without the outer shell) in Embodiment Six of this utility model.

[0050] Figure 24 This is a cross-sectional schematic diagram of the motor rotor in Embodiment Six of this utility model.

[0051] Figure label:

[0052] 100. Motor rotor;

[0053] 1. Rotor core; 11. Limiting groove;

[0054] 2. Balancing component; 21. Substrate; 211. Cavity; 2111. Spherical cavity; 2112. Columnar hole; 2113. Strip groove; 212. Limiting post; 213. Plate body; 214. Arm; 22. Balancing element; 221. Balancing ball; 222. Balancing block;

[0055] 3. Magnets;

[0056] 4. Outer shell; 41. End plate;

[0057] 5. Shaft. Detailed Implementation

[0058] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0059] The following describes a motor rotor and a motor having the same rotor as embodiments of the present invention.

[0060] like Figures 1 to 24 As shown, the motor rotor 100 of this utility model embodiment includes a rotor core 1, a balancing assembly 2, and a magnet 3.

[0061] The rotor core 1 is connected to the motor shaft 5. The balancing assembly 2 includes a base 21 and a balancing element 22. The base 21 is connected to the axial end or radial outer wall of the rotor core 1. The base 21 has a central hole in its middle for the shaft 5 to pass through. The base 21 can be fixed to the rotor core 1 by adhesive bonding, potting, or plastic coating. The base 21 is restricted from moving radially, axially, or circumferentially along the rotor core 1. Before the base 21 is fixed to the rotor core 1, it can be pre-assembled with the rotor core 1 through a limiting structure, thereby restricting the base 21 from moving radially or circumferentially relative to the rotor core 1 and improving the positioning accuracy between the base 21 and the rotor core 1. When plastic coating, adhesive bonding or potting is performed, the relative position between the substrate 21 and the rotor core 1 can be prevented from shifting, while the axial movement of the substrate 21 is restricted, avoiding the introduction of new external factors that lead to poor dynamic balance performance, and improving the structural stability of the substrate 21 and the rotor core 1.

[0062] For example, such as Figures 4 to 7As shown, the base 21 has a first limiting part, and the rotor core 1 has a second limiting part. One of the first limiting part and the second limiting part is a limiting post 212, and the other is a limiting groove 11. The limiting post 212 and the limiting groove 11 are matched and inserted to form a limiting structure to restrict the radial movement of the balancing assembly 2 along the rotor core 1. Preferably, the first limiting part on the base 21 is the limiting post 212, and the second limiting part on the rotor core 1 is the limiting groove 11. There can be multiple limiting posts 212, which are arranged circumferentially on the base 21. The cross-section of the limiting post 212 can be generally circular, rectangular, trapezoidal, or other shapes. The limiting groove 11 on the rotor core 1 matches the outer contour of the limiting post 212 to ensure that no radial movement occurs after they are inserted. At this time, no circumferential rotation occurs between the rotor core 1 and the base 21.

[0063] For example, an outer shell 4 is provided to cover the outside of the rotor core 1 and the balancing assembly 2. The outer shell 4 can fix the rotor core 1 and the balancing assembly 2 together and restrict the radial movement of the balancing assembly 2 along the rotor core 1. Optionally, one axial end of the outer shell 4 has an end plate 41, and the other end of the outer shell 4 is open. The rotor core 1 and the balancing assembly 2 are placed in the inner cavity of the outer shell 4 through the open end of the outer shell 4. After riveting the open end of the outer shell 4, an annular flange opposite to the end plate 41 is formed, thereby fixing the rotor core 1 and the balancing assembly 2. The whole structure is easy to assemble and has good structural stability.

[0064] The base 21 can be located at one end of the rotor core 1 along its axial direction, or it can be located at both ends of the rotor core 1 along its axial direction. The main structure of the base 21 is roughly disc-shaped, and the outer edge of the base 21 can be roughly flush with or smaller than the outer edge of the rotor core 1.

[0065] The base 21 has multiple cavities 211 for accommodating balancing elements 22, with at least some cavities 211 containing balancing elements 22. It is understood that during rotor dynamic balancing, no balancing elements 22 are placed within any of the cavities 211. However, after the rotor is placed on a dynamic balancing testing device for testing, by placing balancing elements 22 within some cavities 211, the mass distribution of the rotor is altered, reducing the vibration or dynamic load caused by centrifugal force due to center of mass eccentricity to within acceptable limits, thus achieving dynamic balancing adjustment.

[0066] The multiple cavities 211 in the base 21 are evenly distributed circumferentially around the axis of the rotor core 1 on the base 21, which can improve the dynamic balance performance after the base 21 is connected to the rotor core 1 and facilitate rapid dynamic balance adjustment during dynamic balance correction. The structure of the cavities 211 in the base 21 can take different forms, such as spherical cavities 2111, columnar holes 2112, strip-shaped grooves 2113, etc.

[0067] like Figure 2 As shown, when the cavity 211 in the base 21 can be a spherical cavity 2111, the balancing element 22 can be a spherical balancing ball 221. The balancing ball 221 can be fixed in the cavity 211 of the base 21 by interference fit, thereby adjusting the dynamic balance performance of the motor rotor 100 by increasing its weight. The spherical cavity 2111 can be set on the axial end face of the base 21 or on the circumferential outer edge of the base 21.

[0068] like Figure 2 As shown, when the cavity 211 in the base 21 is a cylindrical hole 2112, for example, the cross-section of the cavity 211 is circular or a regular polygon, the cylindrical hole 2112 is arranged on the axial end face of the base 21, and the axis of the cylindrical hole 2112 is parallel to the axis of the rotor core 1. Alternatively, the cylindrical hole 2112 is arranged on the circumferential outer edge of the base 21 (not shown in the figure), and the axis of the cylindrical hole 2112 is orthogonal to the axis of the rotor core 1. In this case, multiple cylindrical holes 2112 are arranged radially on the base 21. The balancing element 22 is a balancing block, and the cross-section of the balancing block matches the cross-section of the cavity 211. The balancing block can be fixed in the cavity 211 by interference fit. At the same time, the length of the balancing block can be adjusted according to the weight increase requirements. When the position of the balancing block 222 in the cylindrical hole 2112 affects the mass distribution of the rotor, the dynamic balance can also be adjusted by adjusting the interference fit depth of the balancing block in the cylindrical hole 2112.

[0069] like Figure 3 As shown, when the cavity 211 in the base 21 is a strip-shaped groove 2113, the strip-shaped groove 2113 is arranged on the axial end face of the base 21, and the length direction of the strip-shaped groove 2113 is orthogonal to the axial direction of the rotor core 1. Multiple strip-shaped grooves 2113 are arranged radially on the base 21. The balancing element 22 is a balancing block 222, which is interference-fitted into the strip-shaped groove 2113 on the base 21. The length of the balancing block 222 can be adjusted according to the weight increase requirements. Since the radial position of the balancing block 222 in the base 21 affects the mass distribution of the rotor, the dynamic balance can be adjusted by adjusting the position of the balancing block 222 in the strip-shaped groove 2113.

[0070] The substrate 21 is generally made of a low-density material such as plastic to reduce the rotor's moment of inertia. The balancing element 22 is generally made of a high-density metal such as iron or copper to achieve dynamic balance of the rotor with minimum moment of inertia.

[0071] The magnet 3 is connected to the rotor core 1. Specifically, the magnet 3 can be surface-mounted on the circumferential wall of the rotor core 1. Alternatively, slots can be provided on the rotor core 1, and the magnet 3 can be embedded in the slots of the rotor core 1. The magnet 3 can be a straight magnet or multiple magnets 3 arranged radially inside the rotor core 1.

[0072] In this embodiment of the invention, the motor rotor 100 achieves dynamic balancing by placing a balancing element 22 within a portion of the cavity 211, allowing the rotor to rotate smoothly. This weight-adding method enhances the rotor's stability. Simultaneously, by restricting the radial movement of the balancing assembly 2 within the rotor core 1, the positioning between the balancing assembly 2 and the rotor core 1 is facilitated, improving the stability of the connection structure between them.

[0073] The motor rotor 100 in some specific embodiments of this utility model is described below.

[0074] Example 1: As Figures 8 to 10 As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, and magnets 3. The magnets 3 are straight-line magnets embedded within the rotor core 1. The base 21 of the balancing assembly 2 is fixed to both ends of the rotor core 1 via adhesive bonding, potting, or plastic coating. A limiting post 212 is provided on the side of the base 21 closest to the rotor core 1, and a limiting groove 11 matching the limiting post 212 is provided on the rotor core 1. Before the base 21 is fixed to the rotor core 1, relative rotation or radial displacement between the rotor core 1 and the base 21 can be prevented. A cavity 211 is provided on the end face of the base 21 away from the rotor core 1. Multiple cavities 211 are evenly distributed and spaced on the base 21 in a circular pattern. The cavity 211 is a spherical cavity 2111 or a columnar hole. The balancing element 22 is a balancing ball 221, which is press-fitted into the cavity 211 of the base 21.

[0075] Example 2: Figures 11 to 13As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, and magnets 3. Multiple magnets 3 are arranged radially within slots in the rotor core 1. The base 21 of the balancing assembly 2 is fixed to both ends of the rotor core 1 via adhesive bonding, potting, or plastic coating. A limiting post 212 is provided on the side of the base 21 closest to the rotor core 1, and a limiting groove 11 matching the limiting post 212 is provided on the rotor core 1. Before the base 21 is fixed to the rotor core 1, relative rotation or radial displacement between the rotor core 1 and the base 21 can be prevented. A cavity 211 is provided on the end face of the base 21 facing away from the rotor core 1. Multiple cavities 211 are evenly distributed circumferentially on the base 21. The cavities 211 are either spherical cavities 2111 or cylindrical holes. The balancing element 22 is a balancing ball 221, which is press-fitted into the cavity 211 of the base 21.

[0076] Example 3: Figures 14 to 16 As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, magnets 3, and a housing 4. Multiple magnets 3 are arranged radially within slots in the rotor core 1. The base 21 of the balancing assembly 2 is fixed to both ends of the rotor core 1 via adhesive bonding, potting, or plastic coating. A cavity 211 is provided on the end face of the base 21 facing away from or near the rotor core 1. The cavity 211 is a strip-shaped groove 2113, and multiple cavities 211 are radially and evenly distributed on the base 21. The length direction of the strip-shaped groove 2113 is orthogonal to the axial direction of the rotor core 1. The balancing element 22 is a strip-shaped balancing block 222, which is press-fitted into the cavity 211 of the base 21. The outer casing 4 is a metal sleeve that covers the outside of the rotor core 1 and the balancing assembly 2. The outer casing 4 can radially limit the base 21 and prevent the balancing block 222 from being thrown out radially.

[0077] Example 4: Figures 17 to 19As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, magnets 3, and a housing 4. Multiple magnets 3 are surface-mounted on the circumferential wall of the rotor core 1. The substrate 21 of the balancing assembly 2 is fixed to both ends of the rotor core 1 by adhesive bonding, potting, or plastic coating. A cavity 211 is provided on the end face of the substrate 21 facing away from or near the rotor core 1. The cavity 211 is a strip-shaped groove 2113, and multiple cavities 211 are radially and evenly distributed on the substrate 21. The length direction of the strip-shaped groove 2113 is orthogonal to the axial direction of the rotor core 1. The balancing element 22 is a strip-shaped balancing block 222, which is press-fitted into the cavity 211 of the substrate 21. The outer casing 4 is a metal sleeve that covers the outside of the rotor core 1 and the balancing assembly 2. The outer casing 4 can radially limit the base 21 and prevent the balancing block 222 from being thrown out radially. In addition, the outer casing 4 can also prevent the surface-mounted magnet 3 from moving radially relative to the rotor core 1.

[0078] Example 5: Figure 20 and Figure 21 As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, magnets 3, and a housing 4. The structure of this embodiment is basically the same as that of Embodiment 4, except that a cavity 211 is provided on the end face of the base 21 facing away from the rotor core 1. Multiple cavities 211 are evenly distributed circumferentially on the base 21, and the cavities 211 are either spherical or cylindrical countersunk holes. The balancing element 22 is a balancing ball 221, which is press-fitted into the cavity 211 of the base 21. The housing 4 is a metal sleeve that covers the outside of the rotor core 1 and the balancing assembly 2, and the housing 4 can radially limit the movement of the base 21. Figure 20 As shown, the outer casing 4 does not need to limit the open end of the cavity 211. Normally, the balance ball 221 is interference-fitted into the cavity 211 and will not detach from it. For example... Figure 21 As shown, after the outer shell 4 is assembled with the base 21 and the rotor core 1, the outer shell 4 can cover the outside of the cavity 211, thereby sealing one open end of the cavity 211 and preventing the balance ball 221 from detaching from the cavity 211. In addition, the outer shell 4 can also prevent the surface-mounted magnet 3 from moving radially relative to the rotor core 1.

[0079] Example 6: Figures 22 to 24As shown, a motor rotor 100 includes a rotor core 1, a balancing assembly 2, magnets 3, and a housing 4. Multiple magnets 3 are attached to the circumferential wall of the rotor core 1. The base 21 includes a plate body 213 and multiple arms 214. The arms 214 are evenly distributed circumferentially along the plate body 213 and extend axially along the rotor core 1. The plate body 213 is located at one end of the rotor core 1. Arms 214 are positioned between at least some adjacent magnets 3. Cavities 211 are distributed on the plate body 213 and / or the arms 214. For example, cavities 211 are distributed on the arms 214, or cavities 211 are arranged on both the plate body 213 and the arms 214. In this embodiment, the cavities 211 are distributed on the arms 214. The cavities 211 on the arms 214 are evenly distributed at intervals along the length of the arms 214. Preferably, the cavities 211 on the multiple arms 214 are arranged one-to-one in the circumferential direction of the rotor core 1. The plate body 213 is fixed to both ends of the rotor core 1 by adhesive bonding, potting, or plastic coating.

[0080] The cavity 211 is either a spherical cavity or a cylindrical hole, and the balancing element 22 is a balancing ball 221, which is press-fitted into the cavity 211. The outer casing 4 is a metal sleeve that covers the outside of the rotor core 1 and the balancing assembly 2. The plate body 213 and the arm 214 form a constraint with the rotor core 1, which can limit circumferential rotation or radial displacement between them. At the same time, the outer casing 4 can radially limit the balancing ball 221. The outer casing 4 can cover the outside of the cavity 211, thereby sealing one open end of the cavity 211 and preventing the balancing ball 221 from detaching from the cavity 211. In addition, the outer casing 4 can also prevent the surface-mounted magnet 3 from radially moving relative to the rotor core 1.

[0081] In the above implementation, during rotor dynamic balancing, balancing elements are placed within a portion of the cavity to ensure smooth rotor rotation. This weight-addition method achieves rotor dynamic balancing and improves rotor stability. Simultaneously, this embodiment restricts the radial movement of the balancing assembly within the rotor core, ensuring precise positioning between the balancing assembly and the rotor core. This improves the stability of the connection structure between the dynamic balancing assembly and the rotor core, thereby enhancing motor performance.

[0082] The motor of this embodiment includes a shaft and a rotor, wherein the rotor is the motor rotor of any of the above embodiments, and the rotor is fixed on the shaft. The beneficial effects obtained by the motor of this embodiment are the same as those obtained by the motor rotor of any of the above embodiments, and therefore will not be described again.

[0083] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0086] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor rotor, characterized in that, include: Rotor core; A balancing assembly comprising a base and balancing elements, the base being connected to the rotor core and the base being restricted to move radially, axially, or circumferentially along the rotor core, the base having a plurality of cavities for accommodating the balancing elements, at least a portion of the cavities containing the balancing elements.

2. The motor rotor according to claim 1, characterized in that, The substrate is located at at least one end of the rotor core along its axial direction, and the plurality of cavities are evenly distributed circumferentially on the substrate around the axis of the rotor core.

3. The motor rotor according to claim 2, characterized in that, The cavity is a spherical cavity; Alternatively, the cavity may be a columnar hole, which is arranged on the axial end face of the substrate, and the axis of the columnar hole is parallel to the axis of the rotor core. Alternatively, the cavity may be a columnar hole, which is arranged on the circumferential outer edge of the substrate, and the axis of the columnar hole is orthogonal to the axis of the rotor core. Alternatively, the cavity may be a strip-shaped groove arranged on the axial end face of the substrate, with the length direction of the strip-shaped groove being orthogonal to the axial direction of the rotor core.

4. The motor rotor according to claim 1, characterized in that, The base has a first limiting part, and the rotor core has a second limiting part. One of the first limiting part and the second limiting part is a limiting post and the other is a limiting groove. The limiting post and the limiting groove are matched and inserted to restrict the balancing assembly from moving radially or circumferentially along the rotor core.

5. The motor rotor according to claim 1, characterized in that, It also includes an outer casing that covers the outside of the rotor core and the balancing assembly to restrict the radial movement of the balancing assembly along the rotor core.

6. The motor rotor according to claim 5, characterized in that, One axial end of the outer casing has an end plate, and the other end of the outer casing is open. The rotor core and the balancing assembly are placed in the inner cavity of the outer casing from the open end of the outer casing. The open end of the outer casing is riveted to fix the rotor core and the balancing assembly. And / or, the outer casing covers the outside of the cavity to prevent the balancing element from dislodging from the cavity.

7. The motor rotor according to claim 1, characterized in that, The substrate is fixed on the rotor core by adhesive bonding, potting, or plastic coating. And / or, the balancing element is a balancing ball or a balancing block, and the balancing element is press-fitted onto the base.

8. The motor rotor according to any one of claims 1 to 7, characterized in that, It also includes magnets, the rotor core has slots, and the magnets are embedded in the slots of the rotor core; The magnet is a straight magnet, or multiple magnets are arranged radially inside the rotor core.

9. The motor rotor according to any one of claims 1 to 7, characterized in that, It also includes magnets, which are attached to the circumferential wall of the rotor core.

10. The motor rotor according to claim 9, characterized in that, The substrate includes a plate body and multiple arms. The multiple arms are evenly distributed around the circumference of the plate body and extend along the axial direction of the rotor core. The plate body is located at one end of the rotor core. The arms are arranged between at least some adjacent magnets. The cavities are distributed on the plate body and / or the arms. The cavities located on the arms are evenly distributed at intervals along the length direction of the arms.

11. An electric motor, characterized in that, It includes a rotating shaft and a rotor, wherein the rotor is a motor rotor as described in any one of claims 1 to 10, and the rotor is disposed on the rotating shaft.

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