Rotor structure and electric machine

Abstract

The application discloses a rotor structure and a motor. The rotor structure comprises a plastic-coated framework, a rotor core and a balance filling body. The plastic-coated framework is fixed to at least one axial end surface of the rotor core. A plurality of adjusting grooves extending in the radial direction are arranged on the end surface of the plastic-coated framework, which is away from the rotor core. A protrusion is arranged on the inner wall of the adjusting groove. The protrusion separates the inner part of the groove into a plurality of accommodation units with independent accommodation spaces. The balance filling body is arranged in the accommodation unit. During dynamic balance correction, the balance filling body can be filled in the corresponding accommodation unit according to the detected unbalance amount phase, and the filling position can be accurately controlled. The balance filling body is constrained by the three-dimensional structure of the groove and the protrusion, and is not easy to move and fall out when the rotor rotates at high speed. The motor can be stably operated for a long time, and has an energy-saving effect.

Description

Technical Field

[0001] This invention relates to the field of motor rotor dynamic balancing technology, specifically to a rotor structure and a motor. Background Technology

[0002] Electric motors, as core power actuators, are widely used in industrial production, consumer electronics, transportation, and many other fields. The rotor, as the core rotating component of the motor, directly affects the vibration amplitude, operating noise, and service life of the entire motor. The industry commonly uses balancing putty or counterweights on the rotor end face for dynamic balancing calibration to offset rotor imbalances generated during core machining and component assembly. Currently, many rotor end faces are flat, solid surfaces. When balancing putty is directly applied to a flat end face, the material only relies on its own adhesion to the rotor end face, lacking a solid structure to constrain the material. Using discrete counterweight holes results in a fixed hole layout, making it difficult to flexibly adapt to imbalances of different phases and sizes. Under high-speed motor operation, the directly attached balancing filler material is continuously subjected to the combined effects of centrifugal force and airflow on the end face, easily leading to displacement or even detachment, thus causing the motor's dynamic balance to fail. Especially in the application of high-efficiency and energy-saving motors, the displacement and shedding of the balance filling material will directly increase the motor's operating losses, reduce energy efficiency, and restrict the long-term reliable operation of the energy-saving motor. Summary of the Invention

[0003] The embodiments of the present invention provide a rotor structure and a motor, which solves the technical problems of existing rotors lacking suitable limiting and accommodating structures and the easy displacement and fall-off of the balancing filler material used for dynamic balancing correction.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a rotor structure including a plastic-coated frame, a rotor core, and a balancing filler. The plastic-coated frame is fixedly disposed on at least one axial end face of the rotor core. A plurality of adjustment grooves are formed on the end face of the plastic-coated frame facing away from the rotor core. The adjustment grooves extend radially along the rotor, and the inner wall of the adjustment grooves is provided with protrusions. The protrusions are located within the groove cavities of the adjustment grooves and divide the adjustment grooves into a plurality of receiving units. The balancing filler is disposed within the receiving units.

[0005] Furthermore, the adjusting groove extends radially along the rotor from the inner diameter side near the axis to the outer diameter side near the outer edge, and the width and depth of the adjusting groove gradually increase from the inner diameter side to the outer diameter side.

[0006] Furthermore, the protrusions extend along the bottom surface of the adjustment groove to the sidewall surfaces on both sides, forming a bottom protrusion section at the bottom of the groove and a side protrusion section on both sidewalls, respectively. The bottom protrusion section and the side protrusion section are an integral continuous structure. Multiple protrusions are arranged at intervals along the extension direction of the adjustment groove.

[0007] Furthermore, the adjusting groove extends radially along the rotor in a spiral pattern, and the spiral extension direction of the adjusting groove is consistent with the working rotation direction of the rotor structure after assembly. The adjusting groove extends spirally outward from a position close to the rotor axis.

[0008] Furthermore, there are two plastic-coated skeletons, which are respectively fixedly disposed on the two axial end faces of the rotor core. The adjustment grooves are evenly distributed on the plastic-coated skeletons on the two axial end faces, and the spiral extension directions of the adjustment grooves are opposite.

[0009] Furthermore, a curing protective layer is provided on the side surface of the balancing filler filling inside the accommodating unit facing the outside of the groove. The curing protective layer is simultaneously attached to the exposed surface of the balancing filler and the end face surface of the plastic-coated skeleton. The curing protective layer spans between the balancing filler and the end face of the plastic-coated skeleton, and partially covers the edge of the groove opening of the adjustment groove.

[0010] Furthermore, the cured protective layer is a photosensitive adhesive layer, which is coated and formed on the exposed surface of the balance filler. The photosensitive adhesive layer can receive ultraviolet light and undergo curing. The cured photosensitive adhesive layer is laid on the end face area of ​​the corresponding adjustment groove opening.

[0011] Furthermore, the plastic-coated skeleton is integrally formed on the axial end face of the rotor core by injection molding, and the adjustment groove and protrusion are integrally formed on the axial end face of the plastic-coated skeleton away from the rotor core.

[0012] Furthermore, several adjustment grooves are arranged at uniform intervals along the circumference of the plastic-coated skeleton. The inner end of each adjustment groove is located near the rotor rotation axis, and the outer end of each adjustment groove is located near the outer edge of the plastic-coated skeleton. The adjustment grooves are radially distributed around the rotor rotation axis.

[0013] According to another aspect of this application, an embodiment of the present invention provides an electric motor, including a stator assembly and the rotor structure described above, wherein the rotor structure is rotatably mounted in the inner cavity of the stator assembly, and an annular working air gap is formed between the outer circular surface of the rotor structure and the inner wall surface of the stator assembly.

[0014] Compared with the prior art, the rotor structure of the present invention has the following beneficial effects: The rotor structure provided by this invention comprises three parts: a plastic-coated frame, a rotor core, and a balancing filler. The plastic-coated frame is fixedly disposed on at least one axial end face of the rotor core. Several adjustment grooves are formed on the end face of the plastic-coated frame opposite to the rotor core, and each adjustment groove extends and is arranged along the radial direction of the rotor. The inner wall of the adjustment groove is provided with protrusions, which are located within the groove cavity of the adjustment groove, dividing the internal space of the adjustment groove into multiple accommodating units. Adjacent accommodating units are physically separated by the protrusions, and each accommodating unit has an independent accommodating space.

[0015] When performing dynamic balancing on a rotor, the operator first obtains the magnitude and corresponding phase position of the rotor's imbalance using dynamic balancing testing equipment. Based on the test results, balancing filler is then filled into one or more accommodating units that match the phase of the imbalance. Since each accommodating unit has a fixed position corresponding to a specific angle and radial radius along the rotor's circumference, the addition position and amount of balancing filler can be precisely controlled. After the balancing filler is filled into the accommodating unit, it is constrained by protruding blocks on both sides along the extension direction of the adjustment groove; by the sidewalls of the adjustment groove on both sides along its width; and by the bottom of the groove along its depth, ultimately achieving structural constraint in three-dimensional space. When the rotor is rotating at high speed, the balancing filler cannot move along the extension direction of the adjustment groove, nor will it detach from the groove. This effectively solves the technical problem of existing rotors lacking suitable limiting and accommodating structures, and the balancing filler material used for dynamic balancing easily shifting and falling off.

[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a rotor structure according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3This is a schematic diagram of the structure of the rotor structure in an embodiment of the present invention, showing the cooperation between the adjusting groove and the protrusion; Figure 4 This is a schematic diagram of the structure of a rotor structure according to an embodiment of the present invention, showing the cooperation of adjusting grooves, protrusions, balancing fillers and curing protective layers. Figure 5 This is a schematic diagram of the plastic-coated skeleton in a rotor structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the bottom structure of a rotor structure according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 11. Plastic-coated skeleton; 12. Rotor core; 13. Balancing filler; 111. Adjustment groove; 112. Protrusion; 1121. Bottom protrusion section; 1122. Side protrusion section; 14. Cured protective layer. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0020] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 This embodiment provides a rotor structure, such as Figures 1-6 As shown, the device includes a plastic-coated frame 11, a rotor core 12, and a balancing filler 13. The plastic-coated frame 11 is fixedly disposed on at least one axial end face of the rotor core 12. A plurality of adjustment grooves 111 are formed on the end face of the plastic-coated frame 11 facing away from the rotor core 12. The adjustment grooves 111 extend radially along the rotor. The inner wall of the adjustment grooves 111 is provided with protrusions 112. The protrusions 112 are located in the cavity of the adjustment grooves 111 and divide the adjustment grooves 111 into a plurality of receiving units. The balancing filler 13 is disposed in the receiving unit.

[0024] Specifically, in this embodiment, the rotor core 12 is a rotating structure formed by axially stacking and fixing silicon steel sheets, with a central hole for the rotating shaft to pass through. A plastic-coated frame 11 is injection molded onto the outside of the rotor core 12, covering at least one axial end face and all or part of the outer peripheral surface of the rotor core 12. Several adjusting grooves 111 are formed on the axial end face of the plastic-coated frame 11 facing away from the rotor core 12, extending radially outward from a position near the rotor's rotation axis. The cross-section of the adjusting groove 111 is concave, having a groove bottom and sidewalls on both sides of the groove bottom in the width direction, the groove bottom and the two sidewalls together forming a cavity. Inside the cavity of the adjusting groove 111, a protrusion 112 is provided, protruding from the surface of the groove bottom and / or the surface of the sidewalls into the cavity. The protrusions 112 are multiple segments, arranged at intervals along the extension direction of the regulating groove 111, with each segment spanning the cavity of the regulating groove 111. Two adjacent protrusions 112, together with the bottom and side walls of the regulating groove 111, form an independent receiving unit. The multiple protrusions 112, along the extension direction of the regulating groove 111, divide the entire regulating groove 111 into multiple sequentially arranged receiving units. Each receiving unit is arranged sequentially along the extension direction of the regulating groove 111, and adjacent receiving units are separated by protrusions 112. A balancing filler 13 fills the interior of each receiving unit. The material of the balancing filler 13 is balancing putty, which is plastic and can deform under external force at room temperature to fill the receiving unit. After filling, the balancing filler 13 adheres tightly to the bottom, side walls, and surface of the protrusions 112 of the regulating groove 111. Because the balanced filler 13 is plastic, it can form a shape that adapts to the shape of the inner wall of the accommodating unit after filling.

[0025] As described above, the protrusion 112 divides the internal space of the adjusting groove 111 into multiple independent accommodating units, each with its own independent accommodating space, and the accommodating units are physically separated by the protrusion 112. During the dynamic balancing process, the operator first measures the magnitude and phase position of the rotor's imbalance using a dynamic balancing testing device, and then, based on the test results, fills one or more accommodating units corresponding to the phase position of the imbalance with balancing filler 13. Since each accommodating unit is located at a specific position along the extension direction of the adjusting groove 111, and this position corresponds to a specific angle and a specific radial radius in the rotor's circumferential direction, the operator can precisely control the addition position of the balancing filler 13. After the balancing filler 13 is filled into the accommodating unit, it is constrained by the protrusion 112 on both the front and rear sides along the extension direction of the adjusting groove 111, by the sidewalls of the adjusting groove 111 on both the left and right sides along the width direction of the adjusting groove 111, and by the support of the groove bottom along the depth direction of the adjusting groove 111, thus being constrained in three-dimensional space. When the rotor rotates at high speed, the balance filler 13 cannot move along the extension direction of the adjustment groove 111, nor can it be removed from the adjustment groove 111. This effectively solves the technical problems of existing rotors lacking suitable limiting and accommodating structures and the balance filler material used for dynamic balancing correction being prone to displacement and falling off.

[0026] In a specific embodiment, such as Figure 1 As shown, the adjusting groove 111 extends radially along the rotor from the inner diameter side near the axis to the outer diameter side near the outer edge, and the width and depth of the adjusting groove 111 gradually increase from the inner diameter side to the outer diameter side.

[0027] The cross-sectional dimensions of the adjusting groove 111 are not constant in its extension direction, but rather exhibit a continuous variation. The groove is narrower and shallower near the inner end of the adjusting groove 111, extending radially outwards. Both the width and depth gradually increase until the groove reaches its maximum width and depth near the outer edge of the plastic-coated frame 11. Therefore, the volume of each accommodating unit gradually increases from the inner diameter side to the outer diameter side, allowing the accommodating units on the outer diameter side to accommodate more of the balancing filler 13.

[0028] Since the unbalance torque is equal to the product of the unbalance mass and the radius of rotation, the balancing filler 13 filled on the outer diameter side can generate a larger balancing torque under the same mass of balancing filler 13. Therefore, during rotor dynamic balancing, when a larger balancing correction is required, the operator prioritizes filling the balancing filler 13 into the accommodating units closer to the outer diameter side, utilizing the larger volume accommodating units on the outer diameter side to accommodate more balancing filler 13 and generate a larger balancing torque; when a smaller balancing correction is required, the operator prioritizes filling the balancing filler 13 into the accommodating units closer to the inner diameter side, utilizing the smaller volume accommodating units on the inner diameter side to accommodate less balancing filler 13 and generate a smaller balancing torque. This gradual accommodating unit layout allows the operator to flexibly select the appropriate filling position and amount according to the magnitude of the unbalance, eliminating the need to weigh or cut the balancing filler 13 beforehand, thus simplifying the operation process.

[0029] Specifically, such as Figure 3 As shown, the protrusion 112 extends along the bottom surface of the adjusting groove 111 to the side wall surfaces on both sides, forming a bottom protrusion section 1121 located at the bottom of the groove and a side protrusion section 1122 located on both side walls, respectively. The bottom protrusion section 1121 and the side protrusion section 1122 are an integral continuous structure. Multiple protrusion sections 112 are arranged at intervals along the extension direction of the adjusting groove 111.

[0030] Each protrusion 112 is simultaneously provided on the bottom of the regulating groove 111 and on both side walls. Taking a single protrusion 112 as an example, it includes a bottom protrusion 1121 located on the bottom surface of the groove and side protrusions 1122 located on the surfaces of the two side walls respectively. The bottom protrusion 1121 is located on the bottom surface of the regulating groove 111, extending along the width direction of the regulating groove 111, with both ends extending to the junction of the bottom of the groove and the two side walls respectively. The side protrusions 1122 are located on the surfaces of the two side walls respectively, extending upward from the junction of the side wall and the bottom of the groove along the surface of the side wall (i.e., towards the opening of the regulating groove 111). The bottom protrusion 1121 and the side protrusions 1122 are connected by an arc at the junction of the bottom of the groove and the side wall, and the three together form a continuous integral structure. Viewed from the extension direction of the regulating groove 111, a single protrusion 112 spans the entire groove cavity laterally (i.e., in the width direction) along the regulating groove 111. Its cross-sectional shape is an inverted U-shape or V-shape, meaning that the two ends of the protrusion 112 are located on the two side walls, and the middle part is located on the bottom of the groove. Multiple protrusions 112 are arranged at equal or unequal intervals along the extension direction of the regulating groove 111, forming a receiving unit between adjacent protrusions 112. When the operator fills the receiving unit with the balancing filler 13, pressing it makes the balancing filler 13 fill all corners of the receiving unit. The bottom protrusion 1121 and the side protrusion 1122 of the protrusion 112 are embedded into the interior of the balancing filler 13, which greatly increases the bonding area between the balancing filler 13 and the inner wall of the regulating groove 111. Furthermore, the protruding structure of the protrusion 112 forms multiple anchoring points in multiple directions inside the balancing filler 13, enhancing the bonding strength.

[0031] In a specific embodiment, such as Figure 1 and Figure 6 As shown, the adjustment groove 111 extends radially along the rotor in a spiral pattern. The spiral extension direction of the adjustment groove 111 is consistent with the working rotation direction of the rotor structure after assembly. The adjustment groove 111 extends spirally outward from a position close to the rotor axis.

[0032] When the adjusting groove 111 extends from the inside to the outside on the axial end face of the plastic-coated frame 11, its extension direction is not strictly a straight line along the rotor's radial direction, but rather extends outward in a spiral shape with the rotor's rotation axis as the center. The starting end of the adjusting groove 111 is close to the rotor's rotation axis, and the ending end is close to the outer edge of the plastic-coated frame 11. During its extension from the inside to the outside, its extension direction has an inclined angle relative to the pure radial direction. The spiral direction of the adjusting groove 111 (i.e., the direction in which its circumferential angle changes continuously as the radius increases) is set to be consistent with the rotation direction of the motor rotor in actual operation. For example, when the motor rotor rotates counterclockwise in the working state, the adjusting groove 111 extends spirally from the inside to the outside in a counterclockwise direction; when the motor rotor rotates clockwise, the adjusting groove 111 extends spirally from the inside to the outside in a clockwise direction.

[0033] As described above, when the rotor rotates at high speed, the air near the rotor end face rotates along with the rotor due to viscosity, forming a rotating airflow that flows tangentially along the rotor end face. Since the spiral extension direction of the regulating groove 111 is consistent with the rotation direction of the rotor, the orientation of the regulating groove 111 is basically the same as the flow direction of the rotating airflow. The rotating airflow flows smoothly along the orientation of the regulating groove 111, without forming eddies or turbulence inside the regulating groove 111, and without applying a peeling force pointing outward to the balancing filler 13 within the accommodating unit. Conversely, if the spiral direction of the regulating groove 111 is opposite to the rotation direction, the rotating airflow will directly impact the groove wall of the regulating groove 111 and the exposed surface of the balancing filler 13, generating a component force pointing outward to the regulating groove 111 on the balancing filler 13, which can easily cause the balancing filler 13 to loosen and fall off.

[0034] In one embodiment, such as Figure 1 and Figure 6 As shown, there are two plastic-coated skeletons 11, which are respectively fixedly disposed on the two axial end faces of the rotor core 12. The adjustment grooves 111 are evenly distributed on the plastic-coated skeletons 11 on the two axial end faces, and the spiral extension directions of the adjustment grooves 111 are opposite.

[0035] Two plastic-coated skeletons 11 are provided, and each skeleton is fixedly mounted on one of the two axial end faces of the rotor core 12. In other words, the rotor core 12 has a first axial end face and a second axial end face arranged opposite each other along the axial direction. The first plastic-coated skeleton is fixedly mounted on the first axial end face, and the second plastic-coated skeleton is fixedly mounted on the second axial end face. Adjustment grooves 111 are formed on the end face of each plastic-coated skeleton facing away from the rotor core 12. When observing the adjustment grooves 111 on the first and second plastic-coated skeleton end faces from the same perspective (e.g., looking down axially from above the rotor), the adjustment grooves 111 on the first and second plastic-coated skeleton end faces spirally radially in a counterclockwise direction, while the adjustment grooves 111 on the second plastic-coated skeleton spirally radially in a clockwise direction. In other words, the adjustment grooves 111 on the two plastic-coated skeletons 11 are mirror-symmetrical with respect to the axial direction of the rotor core 12. The design is based on the following: when the rotor rotates in a certain direction (e.g., counterclockwise), viewed from above, the airflow at the upper end face rotates counterclockwise; viewed from below, the airflow at the lower end face rotates counterclockwise. However, if viewed from above through the rotor, the airflow at the lower end face appears clockwise. Therefore, setting the adjustment grooves 111 on the two plastic-coated frames 11 to opposite spiral directions ensures that the spiral direction of each adjustment groove 111 on both plastic-coated frames 11 is consistent with the airflow direction at their respective end faces. This allows the adjustment grooves 111 on both plastic-coated frames 11 to reduce the stripping effect of airflow on the balance filler 13. The adjustment grooves 111 on the two plastic-coated frames 11 are independently formed and not connected to each other, each independently achieving dynamic balance adjustment.

[0036] In a specific embodiment, such as Figure 1 and Figure 2 As shown, the surface of the balancing filler 13 filled inside the accommodating unit facing the outside of the groove is covered with a curing protective layer 14. The curing protective layer 14 is attached to both the exposed surface of the balancing filler 13 and the end face of the plastic-coated skeleton 11. The curing protective layer 14 spans between the balancing filler 13 and the end face of the plastic-coated skeleton 11, and partially covers the edge of the groove of the adjustment groove 111.

[0037] The curing protective layer 14 is a thin layer structure coated on the outer surface of the balancing filler 13, and its material is a curable material. After the balancing filler 13 is filled into the receiving unit and pressed flat, the outer surface of the balancing filler 13 (i.e., the side facing the outside of the adjustment groove 111) is exposed to the external environment. A liquid or paste-like curing protective layer 14 material is coated on this outer surface, so that the material not only covers the entire exposed surface of the balancing filler 13, but also extends outward to cover the end face area of ​​the plastic-coated skeleton 11 at the edge of the adjustment groove 111. In other words, the curing protective layer 14 forms an overlap bridge between the end face of the plastic-coated skeleton 11 and the outer surface of the balancing filler 13, with a part attached to the end face surface of the plastic-coated skeleton 11, another part attached to the exposed surface of the balancing filler 13, and the middle part bridging the junction between the two. After the curing protective layer 14 cures, it becomes an adhesive layer that connects the balancing filler 13 and the plastic-coated skeleton 11 into one unit, further restricting the degree of freedom of the balancing filler 13 to move outward along the depth direction (i.e., perpendicular to the bottom of the groove) of the adjusting groove 111. Since the balancing filler 13 is subjected to centrifugal force during rotor rotation, this centrifugal force tends to throw the balancing filler 13 outward along the depth direction of the adjusting groove 111. The curing protective layer 14 spans between the end faces of the balancing filler 13 and the plastic-coated skeleton 11, effectively resisting this centrifugal force and preventing the balancing filler 13 from detaching from the adjusting groove 111.

[0038] Specifically, the cured protective layer 14 is a photosensitive adhesive layer, which is coated and formed on the exposed surface of the balance filler 13. The photosensitive adhesive layer can receive ultraviolet light and be cured and formed. The cured photosensitive adhesive layer is laid on the end face area of ​​the corresponding adjustment groove 111 opening.

[0039] The cured protective layer 14 is formed by coating with photosensitive adhesive (i.e., UV-curable adhesive). The photosensitive adhesive is liquid during coating, exhibiting good fluidity and wettability. It can spread evenly on the exposed surface of the balancing filler 13 and the end face of the plastic-coated skeleton 11, and automatically flow into the tiny gaps between the balancing filler 13 and the sidewalls of the adjusting groove 111. After coating, the coated area is irradiated with a UV lamp of a specific wavelength. The photosensitive adhesive cures under UV light, changing from a liquid to a solid state, forming a dense cured protective layer 14. The cured photosensitive adhesive layer has high hardness and adhesion, tightly adhering to the end face of the plastic-coated skeleton 11 and completely covering and sealing the balancing filler 13. The cured protective layer 14 not only bonds and fixes the balancing filler 13 to the receiving unit, but also forms a protective barrier on the outer surface of the balancing filler 13 because it covers the groove opening area of ​​the adjusting groove 111, preventing external substances from entering the interface between the balancing filler 13 and the inner wall of the adjusting groove 111, thus further ensuring the stability of long-term use.

[0040] In one embodiment, the plastic-coated skeleton 11 is integrally formed on the axial end face of the rotor core 12 by injection molding, and the adjustment groove 111 and the protrusion 112 are integrally formed on the axial end face of the plastic-coated skeleton 11 away from the rotor core 12.

[0041] The plastic-coated frame 11 and the rotor core 12 are integrated through an insert injection molding process. Specifically, the pre-stamped and stacked rotor core 12 is placed as an insert into the cavity of the injection mold, and the positioning mechanism in the mold precisely fixes the rotor core 12 in a predetermined position within the cavity. After mold closing, molten plastic material is injected into the mold cavity, flowing and filling all areas except the space occupied by the rotor core 12. The cavity surface of the injection mold is pre-machined with protrusions and recesses that match the shape of the adjustment groove 111 and the protrusion 112. Therefore, during the injection molding process, when the plastic material fills the corresponding area of ​​the cavity, the adjustment groove 111 and the protrusion 112 are simultaneously formed on the axial end face of the plastic-coated frame 11. After cooling and mold opening, the plastic-coated frame 11, the adjustment groove 111, and the protrusion 112 are continuous components of the same injection molding substrate, and there are no assembly joint interfaces or secondary processing marks between them. This integrated injection molding method ensures the dimensional and shape accuracy of the adjustment groove 111 and the protrusion 112, and eliminates the need for subsequent machining processes, thereby improving production efficiency and product consistency. Furthermore, since the plastic-coated frame 11 is integrated with the rotor core 12 through injection molding, there is no relative movement between the plastic-coated frame 11 and the rotor core 12, ensuring that the positions of the adjustment groove 111 and the protrusion 112 relative to the rotor core 12 remain stable at all times.

[0042] Specifically, such as Figure 5 As shown, several adjustment grooves 111 are arranged at uniform intervals along the circumference of the plastic-coated frame 11. The inner end of each adjustment groove 111 is located near the rotor rotation axis, and the outer end of each adjustment groove 111 is located near the outer edge of the plastic-coated frame 11. The adjustment grooves 111 are radially distributed around the rotor rotation axis.

[0043] Multiple adjusting grooves 111 are evenly arranged circumferentially on the axial end face of the plastic-coated frame 11, with equal circumferential angles between adjacent adjusting grooves 111. The inner end (i.e., the starting end) of each adjusting groove 111 is located near the rotor's rotation axis, and the outer end (i.e., the ending end) of each adjusting groove 111 is located near the outer edge of the plastic-coated frame 11. Viewed as a whole, the multiple adjusting grooves 111 are radially distributed around the rotor's rotation axis, with each groove extending from the inside out, its extension direction having a helical angle relative to the rotor's radial direction. Support ribs are formed on the end face region of the plastic-coated frame 111 between adjacent adjusting grooves 111, with the top surfaces of each support rib lying in the same plane, used for positioning and supporting the rotor during dynamic balancing testing and correction. When the dynamic balancing testing equipment measures the phase position of the unbalance (i.e. the angular direction of the unbalanced mass), the operator can find the corresponding adjustment groove 111 near that angular direction and fill the balance filler 13 into the appropriate accommodating unit of the adjustment groove 111, without having to additionally process the counterweight structure at a specific angular position on the rotor end face.

[0044] Example 2 This embodiment provides an electric motor, including a stator assembly and the rotor structure described in Embodiment 1. The rotor structure is rotatably mounted in the inner cavity of the stator assembly, and an annular working air gap is formed between the outer circular surface of the rotor structure and the inner wall surface of the stator assembly.

[0045] In this embodiment, the motor includes a stator assembly and the aforementioned rotor structure. The stator assembly includes a stator core and stator windings. The stator core is formed by axially stacking and fixing silicon steel sheets, and its inner ring has multiple stator slots circumferentially formed, in which the stator windings are embedded. The inner ring of the stator core forms a hollow stator bore. The rotor structure is rotatably supported in the stator bore of the stator assembly by a shaft and bearings, and the rotation axis of the rotor structure coincides with the central axis of the stator assembly. A uniform annular gap, i.e., a working air gap, is formed between the outer circular surface of the rotor structure (i.e., the outer peripheral surface of the plastic-coated skeleton 11) and the inner wall surface of the stator core. This air gap provides a working path for magnetic field coupling during motor operation.

[0046] The motor in this embodiment is an energy-saving motor. Dynamic balancing of the rotor structure reduces operating vibration and wind resistance losses, improving overall energy efficiency. During motor operation, alternating current is applied to the stator windings, generating a rotating magnetic field within the stator bore. This rotating magnetic field acts on the rotor structure across the working air gap, driving the rotor structure to rotate around its axis of rotation. Since the rotor structure has been dynamically balanced before assembly, the resultant centrifugal force during rotation passes through the axis of rotation, effectively controlling vibration and noise during high-speed operation. Simultaneously, because the balancing filler 13 is firmly held within the housing unit by the spacer and limiter of the protrusions 112 and the adhesive fixation of the cured protective layer 14, the balancing filler 13 will not shift, fall off, or loosen during long-term motor operation, ensuring the durability of the dynamic balancing effect.

[0047] As described above, the core of this embodiment lies in the cooperation between the adjusting grooves 111 and protrusions 112 on the plastic-coated skeletons 11 on the two axial end faces of the rotor core 12, forming multiple independent accommodating units arranged radially along the rotor. Each accommodating unit has a different angular position in the circumferential direction and a different radial radius, and the volume of each accommodating unit gradually increases from the inner diameter side to the outer diameter side. This configuration allows the operator to precisely add the balancing filler 13 at any angular and radial position in the circumferential direction during dynamic balancing correction, and to control the amount of balancing filler 13 added by selecting accommodating units of different volumes, thereby achieving precise matching of both the magnitude and direction of the imbalance. Simultaneously, the two plastic-coated skeletons 11 are respectively disposed on the two axial end faces of the rotor core 12, allowing the operator to perform dynamic balancing correction operations on either or both end faces as needed, further improving the flexibility of adjustment and the achievable balancing accuracy. The protrusion 112 forms a barrier and limit on the balancing filler 13 along the extension direction of the adjustment groove 111. The sidewall and bottom of the adjustment groove 111 limit the balancing filler 13 in the width and depth directions. The curing protective layer 14 further forms a seal and bond, thereby achieving all-round fixation of the balancing filler 13 in three-dimensional space.

[0048] In actual operation, the dynamic balance adjustment process of the rotor structure in this embodiment is as follows: First, the rotor structure is assembled on the rotating shaft of the dynamic balance testing equipment, and the rotor is driven to rotate at the rated speed. The dynamic balance testing equipment measures and records the magnitude and phase position of the rotor's imbalance. Second, based on the test results, the operator determines the position and number of accommodating units that need to be filled with the balance filler 13. Accommodating units can be selected from the corresponding adjustment grooves 111 on any one or both end faces of the rotor core 12 of the plastic-coated skeleton 11 as needed. Specifically, if the imbalance is large and the phase position is clear, the balance filler 13 is filled into the large-volume accommodating unit on the outer diameter side of the adjustment groove 111 corresponding to the phase position; if the imbalance is small, the balance filler 13 is filled into the small-volume accommodating unit on the inner diameter side; if the volume of a single accommodating unit is insufficient to accommodate the required amount of balance filler 13, the balance filler 13 is simultaneously filled into multiple adjacent accommodating units. Next, press the balancing filler 13 into the receiving unit, ensuring it fully fills all corners and removes air bubbles. The protrusion 112 is embedded within the balancing filler 13 to form a mechanical interlock. Then, apply photosensitive adhesive to the surface of the adjustment groove 111 area filled with the balancing filler 13 to form a curing protective layer 14, and cure it using ultraviolet light. Finally, place the rotor structure back on the dynamic balancing testing equipment for retesting to confirm that the imbalance has been reduced to within the allowable range. If it is still not satisfactory, additional balancing fillers 13 can be added to the symmetrically positioned adjustment grooves 111 based on the above steps, or fine adjustments can be made to the current filling position.

[0049] Based on the above structural configuration and working process, the rotor structure and motor of this embodiment have the following technical effects: By adjusting the multiple independent receiving units formed by the groove 111 and the protrusion 112, the operator can precisely add the balancing filler 13 at any angle in the circumferential direction and at any radial radius. Furthermore, by selecting receiving units of different volumes, the amount of balancing filler 13 added can be controlled, achieving precise matching of both the magnitude and direction of the imbalance. The receiving units are arranged sequentially along the extension direction of the adjustment groove 111, with adjacent receiving units operating independently. The operator can selectively fill one or more receiving units with the balancing filler 13. During the adjustment process, there is no need to weigh or cut the balancing filler 13, simplifying the operation.

[0050] By simultaneously setting protrusions 112 on the bottom and side walls of the adjusting groove 111, an integral continuous structure of the bottom protrusion section 1121 and the side protrusion section 1122 is formed. The protrusions 112 are embedded inside the balancing filler 13 to form anchoring points in multiple directions, increasing the contact area and mechanical interlocking force between the inner wall of the adjusting groove 111 and the balancing filler 13. At the same time, the cured protective layer 14 is connected between the exposed surface of the balancing filler 13 and the end face of the plastic-coated skeleton 11, forming an adhesive bridge between the balancing filler 13 and the plastic-coated skeleton 11, further encapsulating the balancing filler 13 within the receiving unit. The physical blocking and limiting of the protrusions 112 and the chemical bonding and fixing of the cured protective layer 14 constitute a dual locking mechanism, enabling the balancing filler 13 to maintain positional stability under the centrifugal force and vibration impact generated by the high-speed rotation of the rotor.

[0051] By setting the regulating groove 111 in a spiral radial shape with the spiral direction consistent with the rotor rotation direction, the airflow on the end face flows smoothly along the spiral direction of the regulating groove 111 when the rotor rotates at high speed. This prevents the formation of eddies or turbulence within the regulating groove 111, reducing the peeling effect on the balancing filler 13 and ensuring the long-term adhesion stability of the balancing filler 13. Two plastic-coated skeletons 11 are respectively disposed on the two axial end faces of the rotor core 12, allowing the spiral direction of the regulating groove 111 on the two end faces to be independently configured according to the airflow direction of their respective end faces, ensuring that both are consistent with the airflow direction of their respective end faces. This simultaneously achieves airflow peeling protection for the balancing filler 13 on both end faces.

[0052] By integrally injection molding the plastic-coated skeleton 11 with the adjusting groove 111 and the protrusion 112, the adjusting groove 111 and the protrusion 112 are directly formed on the axial end face of the plastic-coated skeleton 11 during the injection molding process, eliminating the need for secondary machining, simplifying the manufacturing process, reducing production costs, and ensuring the dimensional and shape accuracy of the adjusting groove 111 and the protrusion 112.

[0053] In other words, this embodiment, by adjusting the coordination of the groove 111, protrusion 112, accommodating unit, balancing filler 13, and curing protective layer 14, provides a rotor structure and motor that facilitates dynamic balance adjustment and prevents the balancing filler 13 from falling off or shifting. This significantly improves the accuracy and efficiency of dynamic balance correction, as well as the stability of the balancing filler 13 during long-term operation. When applied to energy-saving motors, this rotor structure can reduce vibration and windage losses during motor operation through a stable dynamic balance state, resulting in significant energy-saving effects.

[0054] The scope of protection of this invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this invention, and such modifications or substitutions should all be covered within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A rotor structure, characterized in that, The device includes a plastic-coated skeleton, a rotor core, and a balancing filler. The plastic-coated skeleton is fixedly disposed on at least one axial end face of the rotor core. A plurality of adjustment grooves are formed on the end face of the plastic-coated skeleton opposite to the rotor core. The adjustment grooves extend radially along the rotor. The inner wall of the adjustment groove is provided with protrusions. The protrusions are located in the cavity of the adjustment groove and divide the adjustment groove into a plurality of receiving units. The balancing filler is disposed in the receiving unit.

2. The rotor structure according to claim 1, characterized in that, The adjusting groove extends radially along the rotor from the inner diameter side near the axis to the outer diameter side near the outer edge, and the width and depth of the adjusting groove gradually increase from the inner diameter side to the outer diameter side.

3. The rotor structure according to claim 1, characterized in that, The protrusions extend along the bottom surface of the adjustment groove to the sidewalls on both sides, forming a bottom protrusion section at the bottom of the groove and a side protrusion section on both sidewalls, respectively. The bottom protrusion section and the side protrusion section are an integral continuous structure. Multiple protrusions are arranged at intervals along the extension direction of the adjustment groove.

4. The rotor structure according to claim 1, characterized in that, The adjusting groove extends radially along the rotor in a spiral pattern. The spiral extension direction of the adjusting groove is consistent with the working rotation direction of the rotor structure after assembly. The adjusting groove extends spirally outward from a position close to the rotor axis.

5. The rotor structure according to claim 4, characterized in that, The plastic-coated skeleton has two parts, and the two plastic-coated skeletons are respectively fixedly disposed on the two axial end faces of the rotor core. The adjustment grooves are evenly distributed on the plastic-coated skeletons on the two axial end faces, and the spiral extension directions of the adjustment grooves are opposite.

6. The rotor structure according to claim 1, characterized in that, The surface of the balancing filler inside the accommodating unit facing the outside of the groove is covered with a curing protective layer. The curing protective layer is attached to both the exposed surface of the balancing filler and the end face of the plastic-coated skeleton. The curing protective layer spans between the balancing filler and the end face of the plastic-coated skeleton and partially covers the edge of the groove opening of the adjustment groove.

7. The rotor structure according to claim 6, characterized in that, The cured protective layer is a photosensitive adhesive layer, which is coated and formed on the exposed surface of the balance filler. The photosensitive adhesive layer can receive ultraviolet light and be cured. The cured photosensitive adhesive layer is laid on the end face area of ​​the corresponding adjustment groove opening.

8. The rotor structure according to claim 1, characterized in that, The plastic-coated skeleton is integrally formed on the axial end face of the rotor core by injection molding, and the adjustment groove and protrusion are integrally formed on the axial end face of the plastic-coated skeleton away from the rotor core.

9. The rotor structure according to claim 1, characterized in that, Several adjustment grooves are arranged at uniform intervals along the circumference of the plastic-coated skeleton. The inner end of each adjustment groove is located near the rotor rotation axis, and the outer end of each adjustment groove is located near the outer edge of the plastic-coated skeleton. The adjustment grooves are radially distributed around the rotor rotation axis.

10. An electric motor, characterized in that, The device includes a stator assembly and a rotor structure as described in any one of claims 1 to 9, wherein the rotor structure is rotatably mounted in the inner cavity of the stator assembly, and an annular working air gap is formed between the outer circular surface of the rotor structure and the inner wall surface of the stator assembly.

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