Rotor assemblies, motors and electrical equipment

Abstract

The present invention provides a rotor assembly, a motor, and an electrical device, wherein the rotor assembly includes: a rotor core assembly; a rotating shaft extending through the rotor core assembly; and a plastic overmolding assembly located between the rotor core assembly and the rotating shaft, the plastic overmolding assembly being provided with a plurality of magnetic cores and an axially extending rotating shaft cavity, wherein at least a portion of the rotating shaft is located within the rotating shaft cavity, and the rotor core assembly is mounted on the outer circumference of the plastic overmolding assembly; a gap is provided between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity. Providing a gap between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity can reduce the natural frequency of the rotor assembly, thereby avoiding resonance between the rotor assembly and a fan blade in the electrical device and reducing noise from the electrical device.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a rotor assembly, a motor and an electrical device. Background Art

[0002] In the prior art, the motor in the electrical equipment is prone to resonance when the natural frequency of the coupling between the motor rotor assembly and the wind wheel of the electrical equipment is close to the electromagnetic excitation within the operating speed of the electrical equipment, which in turn causes the electrical equipment to produce high noise. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first object of the present invention is to provide a rotor assembly.

[0005] The second object of the present invention is to provide a motor.

[0006] The third object of the present invention is to provide an electrical device.

[0007] To achieve at least one of the above-mentioned purposes, according to a first aspect of the present invention, a rotor assembly is proposed, comprising: a rotor core assembly; a rotating shaft passing through the rotor core assembly; a plastic-coated assembly located between the rotor core assembly and the rotating shaft, the plastic-coated assembly being provided with a plurality of magnetic cores, the plastic-coated assembly being provided with a rotating shaft cavity extending axially therethrough, at least a portion of the rotating shaft being located in the rotating shaft cavity, the rotor core assembly being mounted on the outer peripheral side of the plastic-coated assembly; a gap being provided between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity.

[0008] The rotor assembly proposed in this application includes a rotor core assembly and a rotating shaft. A through-hole is defined in the center of the rotor core assembly, and the rotating shaft is inserted into the through-hole. The rotating shaft is driven by a drive motor to rotate, thereby driving the rotor core assembly to rotate along with it through other components.

[0009] Furthermore, to reduce the rotor assembly's shaft voltage, a plastic overmolding assembly is provided within the rotor assembly. Specifically, this assembly is located between the rotor core assembly and the rotating shaft, isolating the rotor core assembly from the rotating shaft. The presence of the plastic overmolding assembly between the rotating shaft and the rotor core assembly reduces the rotor assembly's shaft voltage, improving rotor assembly performance.

[0010] In one possible technical solution, the overmolded component is made of a hard material, such as an insulating material such as plastic. The rotor assembly is formed by injection molding. Specifically, during the rotor assembly manufacturing process, the shaft and rotor core assembly are first placed in a mold. Then, the material for forming the overmolded component is injected into the mold. The material is formed within the mold and forms an integral structure with the shaft and rotor core assembly.

[0011] Furthermore, a plurality of magnetic cores are provided in the overmolded assembly. Since the rotating shaft can drive the overmolded assembly to rotate, when the rotating shaft rotates, the rotating shaft can drive the plurality of magnetic cores to rotate along with the rotating shaft. The magnetic cores can form magnetic lines of force, and the magnetic lines of force can be cut while the magnetic cores rotate along with the rotating shaft. Specifically, during the processing of the rotor assembly, the rotor, the rotor core assembly, and the plurality of magnetic cores can be placed in a mold at the same time, and then the material for forming the overmolded assembly is injected into the mold. The material is formed in the mold and forms an integrated structure with the rotating shaft, the rotor core assembly, and the plurality of magnetic cores to achieve fixation of the overmolded assembly to the rotor core assembly and the plurality of magnetic cores.

[0012] Furthermore, the overmolded assembly is provided with an axially extending shaft cavity, into which a rotating shaft is inserted, at least partially located within the cavity, capable of driving the overmolded assembly for rotation. The rotor core assembly is mounted on the outer periphery of the overmolded assembly. When the rotating shaft drives the overmolded assembly for rotation, the overmolded assembly further drives the rotor core assembly for rotation.

[0013] Furthermore, a gap is provided between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity. Understandably, within the operating speed range of the electrical device, when the natural frequency of the coupling between the motor's rotor assembly and the electrical device's wind wheel is close to the electromagnetic excitation, resonance is likely to occur, thereby causing the electrical device to produce relatively high noise. To avoid the occurrence of resonance, it is necessary to reduce the natural frequency of the rotor assembly to reduce the natural frequency of the coupling between the rotor assembly and the fan blades. Providing a gap between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity can effectively reduce the natural frequency of the rotor assembly, thereby avoiding resonance between the rotor assembly and the fan blades in the electrical device and reducing the noise of the electrical device.

[0014] By providing a gap between at least part of the rotating shaft and the inner wall of the rotating shaft cavity, the natural frequency of the rotor assembly can be reduced, thereby avoiding the excitation of the coupling mode between the rotor assembly and the fan blades in the electrical equipment, thereby reducing the noise of the electrical equipment.

[0015] The rotor assembly according to the present invention may also have the following distinguishing technical features:

[0016] In the above technical solution, further, the overmolded assembly includes a main body, the rotor core assembly is connected to the main body, and the axial thickness of the main body is H; the rotating shaft is provided with a first adjustment groove, at least a portion of the wall surface of the first adjustment groove is located within the gap, and the cross-sectional area of the position where the first adjustment groove is provided on the rotating shaft is S; the axial length of the gap is L, the outer diameter of the rotor assembly is D, the end surface of the main body facing the first end of the rotating shaft is the first end surface, and the axial distance between the first end of the rotating shaft and the first end surface is A, and H, L, D, A, and S satisfy the following relationship:

[0017] And L>0.

[0018] In this technical solution, the size of the gap between the rotor and the inner wall of the rotor cavity is limited. Specifically, the axial length of this gap is limited. As can be seen, the gap between the rotor and the inner wall of the rotor cavity will affect the natural frequency of the rotor assembly. Limiting the axial length of this gap to a reasonable range can effectively reduce the natural frequency of the rotor assembly.

[0019] Furthermore, the dimensions associated with the axial length range of the gap are defined. The overmolded assembly includes a main body, to which the rotor core assembly is connected, and the main body has an axial thickness of H. The rotating shaft is provided with a first adjustment slot, at least a portion of the first adjustment slot's wall being located within the gap, and the cross-sectional area of the rotating shaft where the first adjustment slot is provided is S. The rotor assembly has an outer diameter of D, an end surface of the main body facing the first end of the rotating shaft is the first end surface, and the axial distance between the first end of the rotating shaft and the first end surface is A.

[0020] Furthermore, the length of the gap between the rotor and the inner wall of the rotor cavity in the axial direction is L, and the range of L is related to multiple dimensions in the rotor assembly. Specifically, L is related to A, H, D and S. H, L, D, A and S satisfy the following relationship:

[0021] And L>0. The unit of H, L, D, A is mm, and the unit of S is mm 2 .

[0022] In one possible technical solution, the outer diameter D of the rotor assembly is 44.4 mm, the axial thickness H of the main body is 32.5 mm, the axial distance A between the first end and the first end face of the rotating shaft is 77.75 mm, and the cross-sectional area S of the position where the first adjustment groove is provided on the rotating shaft is 13 mm. 2 The axial length L of the gap between the rotor and the inner wall of the rotor cavity is 14 mm.

[0023] By limiting the range of the length L of the gap between the rotor and the inner wall of the rotor cavity along the axial direction, the natural frequency of the rotor assembly can be effectively reduced.

[0024] In the above technical solution, further, the first end of the rotating shaft can be connected to the driving motor, and the gap is located on a side close to the first end of the rotating shaft.

[0025] In this technical solution, the position where the gap is set is defined. Specifically, the rotating shaft includes a first end and a second end, the first end of the rotating shaft can be connected to the drive motor, and the gap between the rotating shaft and the cavity wall of the rotating shaft cavity is located on the side close to the first end of the rotating shaft. It can be understood that the drive motor applies the driving torque to the first end of the rotating shaft so that the rotating shaft can rotate, and the rotating shaft then drives the overmolded component to rotate, so the part of the overmolded component close to the first end of the rotating shaft vibrates more violently. In order to make the gap between the rotating shaft and the inner wall of the rotating shaft cavity more effectively reduce the natural frequency of the rotor assembly, the present application sets the gap on the side close to the first end of the rotating shaft, that is, sets the gap on the side close to the drive motor, so as to improve the effect of the gap in adjusting the natural frequency of the rotor assembly.

[0026] In the above technical solution, further, the shaft cavity includes a first mounting section and a second mounting section, the inner wall of the first mounting section is tightly fitted with the shaft, the gap is located in the second mounting section, and the inner diameter of the second mounting section is larger than the maximum outer diameter of the shaft located in the second mounting section.

[0027] This technical solution defines the structure of the shaft cavity. The shaft cavity has a variable diameter structure and specifically includes a first mounting section and a second mounting section. The inner wall of the first mounting section closely mates with the shaft. When the shaft rotates, the shaft, through the closely mateable first mounting section, drives the overmolded assembly to rotate synchronously with the shaft, which in turn drives the rotor core assembly through the overmolded assembly.

[0028] Furthermore, the gap is located within the second mounting section, which is closer to the first end of the rotating shaft than the first mounting section. The inner diameter of the second mounting section is greater than the maximum outer diameter of the rotating shaft at the second mounting section. This means that a certain distance exists between the rotating shaft at any point within the second mounting section and the inner wall of the second mounting end. This gap between the inner wall of the second mounting section and the rotating shaft effectively reduces the natural frequency of the rotor assembly.

[0029] Furthermore, to facilitate the machining of the gap between the rotating shaft and the inner wall of the rotating shaft cavity, a boss is provided on the rotating shaft. The boss is provided on the outer wall of the rotating shaft located within the second mounting section. Specifically, during the machining of the rotor assembly, after the rotating shaft is placed in the mold and before the material of the overmolded component is injected into the mold, a support sleeve is placed on the rotating shaft. The boss is used to limit the support sleeve. In this way, the support sleeve can form a gap between the inner wall of the rotating shaft cavity of the overmolded component and the rotating shaft. After the overmolded component is formed, the support sleeve is removed. It is understandable that if the support sleeve is not placed on the rotating shaft during the injection molding process, the portion of the rotating shaft located in the mold will be tightly attached to the overmolded component, and no gap can be formed between the rotating shaft and the overmolded component. In order to allow at least part of the rotating shaft to be separated from the overmolded component to form a gap between the two, the present application provides a boss on the rotating shaft. The boss limits the support sleeve by limiting the support sleeve. The support sleeve can then separate the overmolded component material from the rotating shaft, thereby forming a gap between the rotating shaft and the overmolded component.

[0030] By setting the inner diameter of the second mounting section to be larger than the maximum outer diameter of the rotating shaft located in the second mounting section, a distance can be left between the rotating shaft and the inner wall of the second mounting section, thereby reducing the natural frequency of the rotor assembly, avoiding resonance between the rotor assembly and the fan blades in the electrical equipment, and reducing the noise of the electrical equipment.

[0031] In the above technical solution, the rotating shaft is further provided with a second adjustment groove, the second adjustment groove is located in the first installation section, the wall of the second adjustment groove is provided with a first connecting member, and the inner wall of the first installation section is provided with a second connecting member. The first connecting member can be adapted to the second connecting member so that the rotating shaft can drive the plastic-coated component to rotate.

[0032] In this technical solution, to enable the shaft to drive the overmolded assembly to rotate, a first connecting member and a second connecting member are provided on the shaft and the overmolded assembly to fit together. Specifically, the shaft also has a second adjustment groove that fits within the first mounting section of the shaft cavity. Because the first mounting section has a smaller inner diameter than the second mounting section, the second adjustment groove ensures that the shaft fits snugly against the inner wall of the shaft cavity.

[0033] Furthermore, a first connecting member is provided on the wall surface of the second adjustment groove, and a second connecting member is provided on the inner wall of the first mounting section, and the first connecting member and the second connecting member are adapted to each other. In a possible technical solution, the first connecting member is a raised structure, and the second connecting member is a groove structure adapted to the raised structure. The coordination of the raised structure and the groove structure can realize the synchronous rotation of the overmolded component driven by the rotating shaft. Specifically, during the processing of the rotor assembly, the rotating shaft is placed in the mold. Since the wall surface of the second adjustment groove of the rotating shaft is provided with a raised first connecting member, when the material for forming the overmolded component is injected into the mold, the material is formed by adhering to the surface of the mold and the rotating shaft, thereby naturally forming a second connecting member with a groove structure, and making the second connecting member fit tightly with the first connecting member.

[0034] Furthermore, by providing a second connecting groove on the rotating shaft, the natural frequency of the overmolded component can be further reduced.

[0035] By arranging a first connecting member on the wall surface of the second adjustment groove of the rotating shaft, and arranging a second connecting member adapted to the first connecting member on the wall surface of the first installation section of the rotating shaft cavity, the rotating shaft can drive the overmolded component to rotate synchronously through the cooperation of the first connecting member and the second connecting member.

[0036] In the above technical solution, further, the first connecting member and the second connecting member are constructed to be knurled or edged.

[0037] This technical solution defines the structures of the first and second connecting members. Specifically, the first and second connecting members are knurled or ribbed. These knurled and ribbed structures are easy to manufacture and offer high connection strength, thus reducing the production cost of the rotor assembly and improving the reliability of the connection between the shaft and the overmolded assembly.

[0038] Specifically, during the production of the rotor assembly, a knurled or ribbed structure is first machined on the wall surface of the second adjustment groove of the rotor, and then the rotating shaft is placed in a mold. Material for forming the overmolded assembly is then injected into the mold. The material flows along the knurled or ribbed surface of the rotating shaft and adheres tightly to it, thereby forming a knurled or ribbed structure on the inner wall of the first mounting section that matches the knurled or ribbed structure of the rotating shaft. The knurled structure on the first mounting section cooperates with the knurling on the second adjustment groove, achieving the technical effect of the rotating shaft driving the overmolded assembly to rotate.

[0039] In the above technical solution, further, the rotating shaft is provided with at least one third adjustment groove along the axial direction.

[0040] This technical solution further defines the structure of the rotating shaft, with at least one third adjustment slot provided along its axial direction. As can be understood, the adjustment slot can reduce the natural frequency of the rotor assembly. By providing a third adjustment slot on the rotating shaft, the natural frequency of the rotor assembly can be further reduced. Furthermore, the third adjustment slot can reduce the weight of the rotating shaft, and thus the weight of the rotor assembly, contributing to the lightweight design of the product.

[0041] In the above technical solution, further, the rotor core assembly includes: multiple sub-cores; the plastic-coated assembly is provided with multiple core slots along the circumferential direction, the multiple core slots are arranged in one-to-one correspondence with the multiple sub-cores, and any sub-core is located in the core slot.

[0042] This technical solution defines the structure of the rotor core assembly. The rotor core assembly includes multiple sub-cores. To facilitate installation and positioning of the sub-cores, a plurality of core slots are provided within the overmolding assembly. Specifically, the core slots are arranged circumferentially along the overmolding assembly. The number of core slots matches the number of sub-cores, and each sub-core is positioned within a corresponding core slot.

[0043] In one possible technical solution, multiple sub-cores and the overmolded assembly are integrally formed during the injection molding process. Specifically, during the rotor assembly manufacturing process, the multiple sub-cores and the rotating shaft are first placed in a mold, with the rotating shaft located in the center of the mold and the multiple sub-cores near the circumferential edge of the mold. The material used to form the overmolded assembly is then injected into the mold. During the flow process, the material adheres tightly to the rotating shaft and the multiple sub-cores and gradually solidifies to form the overmolded assembly. The molded overmolded assembly forms core slots for accommodating the sub-cores.

[0044] In the above technical solution, further, the rotor core assembly further includes: a mounting member, and the plurality of sub-cores are sequentially connected to the circumferential side of the mounting member.

[0045] In this technical solution, the structure of the rotor core assembly is further defined. The rotor core assembly also includes a mounting member, and a plurality of sub-cores are sequentially connected to the circumferential side of the mounting member. Specifically, the mounting member can be constructed as an annular structure, and a plurality of sub-cores are evenly distributed along the circumference of the annular mounting member. Specifically, when processing the rotor assembly, the rotor core assembly and the rotating shaft are first placed in a mold, and the rotating shaft is placed in the area enclosed by the annular mounting member. Then, the material for forming the overmolding assembly is injected into the mold, and the liquid material flows in the mold and fits with the wall surfaces of the mounting member, the sub-cores and part of the rotating shaft. After the liquid material solidifies, the overmolding assembly fits tightly with the wall surfaces of the mounting member and the sub-cores to fix the rotor core assembly.

[0046] By providing mounting members within the rotor core assembly, the overall strength of the rotor core assembly is enhanced. Furthermore, the mounting members can be used to secure multiple sub-cores, limiting their relative positions. Furthermore, by providing mounting members within the rotor core assembly, the contact area between the overmolded assembly and the rotor core assembly is increased, improving the reliability of the connection between the two assemblies.

[0047] In the above technical solution, further, the overmolded component is provided with a plurality of magnetic core slots along the circumferential direction, the plurality of magnetic cores are provided in a one-to-one correspondence with the plurality of magnetic core slots, and any magnetic core is installed in the magnetic core slot.

[0048] In this technical solution, multiple core slots are provided in the overmolded assembly to secure the magnetic cores. Specifically, the number of core slots matches the number of magnetic cores, with each slot corresponding to each core. A core slot can be located between two adjacent core slots, evenly distributed along the circumference of the overmolded assembly, with any core installed within one of the slots. In one possible technical solution, the magnetic core and sub-core are spaced apart circumferentially along the overmolded assembly.

[0049] In one possible technical solution, during the rotor assembly manufacturing process, multiple sub-cores and multiple magnetic cores are first spaced apart along the circumference of a mold, with a certain distance between the magnetic cores and the mold. The rotating shaft is then placed in the center of the mold. The material for forming the overmolded assembly is then injected into the mold. This material is in a liquid state upon injection and flows along the surfaces of the magnetic cores, sub-cores, and rotating shaft until the liquid material solidifies, completing the overmolded assembly. This naturally forms the magnetic core slots, rotating shaft cavity, and iron core slots within the overmolded assembly.

[0050] By arranging a plurality of magnetic core slots along the circumferential direction in the overmolded component, the magnetic core can be fixed through the magnetic core slots so that the rotor component can work normally.

[0051] In the above technical solution, the overmolded component further includes: a fixing sleeve, the end face of the first end of the main body away from the rotating shaft is the second end face, the fixing sleeve is connected to the second end face, and the fixing sleeve is arranged on the rotating shaft.

[0052] In this technical solution, the structure of the overmolded component is further defined. The overmolded component includes a fixing sleeve, which is adapted to the rotating shaft to improve the fixing effect on the rotating shaft. Specifically, the end face of the first end of the main body of the overmolded component facing away from the rotating shaft is the second end face, and the fixing sleeve is connected to the second end face of the overmolded component, that is, the fixing sleeve is located at the end of the main body of the overmolded component away from the drive motor. The rotating shaft is inserted into the rotating shaft cavity of the overmolded component, and the fixing sleeve is sleeved on the part of the rotating shaft extending from the main body of the overmolded component. It can be understood that the larger the area connected to the overmolded component, the more reliable the connection between the rotating shaft and the overmolded component, and the more stable the relationship between the rotating shaft and the overmolded component. By arranging a fixing sleeve sleeved on the rotating shaft on the second end face of the overmolded component, the contact area between the overmolded component and the rotating shaft can be further increased, thereby further improving the reliability of the connection between the rotating shaft and the overmolded component.

[0053] In a possible technical solution, knurling is provided on the inner wall of the fixed sleeve, and knurling that is adapted to the knurling of the fixed sleeve is also provided on the rotating shaft located inside the fixed sleeve. Through the cooperation of the knurling on the rotating shaft and the fixed sleeve, the connection reliability between the rotating shaft and the plastic-coated component can be improved, and the relative stability between the rotating shaft and the plastic-coated component can be further improved.

[0054] In the above technical solution, further, the rotating shaft is provided with a limiting plane, the limiting plane is close to the first end of the rotating shaft, and the limiting plane is used to cooperate with the driving motor so that the driving motor can drive the rotating shaft to rotate.

[0055] In this technical solution, a limiting surface is also provided on the rotating shaft. When a drive motor is connected to the rotating shaft, the limiting surface cooperates with the drive motor to enable the drive motor to drive the rotating shaft. Specifically, the limiting surface is located near the first end of the rotating shaft, to which the drive motor is connected. When the rotating shaft is connected to the drive motor, the limiting surface on the rotating shaft inserts into and cooperates with the drive motor. The driving torque of the drive motor acts on the limiting surface, thereby achieving the technical effect of the drive motor driving the rotating shaft to rotate.

[0056] In the above technical solution, the rotor assembly further includes: a first bearing, which is sleeved on the rotating shaft and located between the limiting plane and the plastic-coated assembly; and a second bearing, which is sleeved on the second end of the rotating shaft away from the first end.

[0057] This technical solution further defines the structure of the rotor assembly, including a first bearing and a second bearing, each of which is mounted on either side of the rotating shaft extending beyond the overmolded assembly. Specifically, the first bearing is mounted on the rotating shaft, positioned between the limiting plane and the overmolded assembly, while the second bearing is mounted on the rotating shaft, positioned at a second end of the rotating shaft facing away from the first end. The first and second bearings are mounted on either side of the rotating shaft extending beyond the overmolded assembly, respectively, to secure the rotating shaft, ensuring stable rotation of the overmolded assembly when driven by the drive motor.

[0058] The second aspect of the present invention further provides an electric motor, comprising the rotor assembly provided in the first aspect of the present invention.

[0059] The motor provided in the second aspect of the present invention includes the rotor assembly proposed in the first aspect of the present invention, and thus has all the beneficial effects of the rotor assembly.

[0060] The third aspect of the present invention further provides an electrical device, comprising the rotor assembly provided in the first aspect of the present invention, or the motor provided in the second aspect of the present invention.

[0061] The electrical equipment provided in the third aspect of the present invention includes the rotor assembly provided in the first aspect of the present invention or the motor provided in the second aspect of the present invention, and thus has all the beneficial effects of the rotor assembly or the motor.

[0062] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0064] Figure 1 One of the structural schematic diagrams of a rotor assembly according to an embodiment of the present invention is shown;

[0065] Figure 2 A second structural schematic diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0066] Figure 3 A third structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0067] Figure 4 A fourth structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0068] Figure 5 A fifth structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0069] Figure 6 One of the structural schematic diagrams of the overmolding component of one embodiment of the present invention is shown;

[0070] Figure 7 A second structural diagram of a plastic-coated component according to an embodiment of the present invention is shown;

[0071] Figure 8 One of the structural schematic diagrams of a rotor core assembly according to an embodiment of the present invention is shown;

[0072] Figure 9 A second structural schematic diagram of a rotor core assembly according to an embodiment of the present invention is shown;

[0073] Figure 10 One of the structural schematic diagrams of the main body of the overmolded component according to one embodiment of the present invention is shown;

[0074] Figure 11 A second structural diagram of the main body of the overmolded component according to an embodiment of the present invention is shown;

[0075] Figure 12 The third structural diagram shows the main body of the overmolded component according to one embodiment of the present invention;

[0076] Figure 13 A schematic structural diagram of a rotating shaft according to an embodiment of the present invention is shown.

[0077] in, Figures 1 to 13 The corresponding relationship between the reference numerals and component names is as follows:

[0078] 100 rotor assembly, 110 rotor core assembly, 111 sub-core, 112 mounting member, 120 rotating shaft, 121 first adjusting slot, 122 second adjusting slot, 123 third adjusting slot, 124 limiting plane, 125 boss, 130 overmolded assembly, 131 magnetic core, 132 rotating shaft cavity, 133 main body, 134 first end face, 135 first mounting section, 136 second mounting section, 137 core slot, 138 magnetic core slot, 139 second end face, 140 gap, 150 fixing sleeve, 160 first bearing, 170 second bearing. DETAILED DESCRIPTION

[0079] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0080] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0081] Refer to the following Figures 1 to 13 The rotor assembly 100 , motor, and electrical equipment provided according to some embodiments of the present invention are described.

[0082] Example 1:

[0083] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the first aspect of the present invention proposes a rotor assembly 100, comprising: a rotor core assembly 110; a rotating shaft 120, which is arranged through the rotor core assembly 110; an overmolded assembly 130, which is located between the rotor core assembly 110 and the rotating shaft 120, and the overmolded assembly 130 is provided with a plurality of magnetic cores 131, and the overmolded assembly 130 is provided with an axially extending rotating shaft cavity 132, at least a portion of the rotating shaft 120 is located in the rotating shaft cavity 132, and the rotor core assembly 110 is installed on the outer peripheral side of the overmolded assembly 130; a gap 140 is provided between at least a portion of the rotating shaft 120 and the inner wall of the rotating shaft cavity 132.

[0084] The rotor assembly 100 proposed in this application includes a rotor core assembly 110 and a rotating shaft 120. A through hole is defined in the center of the rotor core assembly 110, and the rotating shaft 120 is inserted into the through hole. The rotating shaft 120 is driven by a drive motor to rotate, thereby driving the rotor core assembly 110 to rotate via other components.

[0085] Furthermore, to reduce the shaft voltage of rotor assembly 100, an overmolding assembly 130 is provided in rotor assembly 100. Specifically, overmolding assembly 130 is located between rotor core assembly 110 and rotating shaft 120, isolating rotor core assembly 110 from rotating shaft 120 via overmolding assembly 130. The presence of overmolding assembly 130 between rotating shaft 120 and rotor core assembly 110 reduces the shaft voltage of rotor assembly 100, thereby improving the performance of rotor assembly 100.

[0086] In one possible embodiment, the material of the overmolded component 130 is a hard material, which can be an insulating material such as plastic. The rotor assembly 100 is formed by injection molding. Specifically, during the manufacturing process of the rotor assembly 100, the rotating shaft 120 and the rotor core assembly 110 are first placed in a mold. Then, the material used to form the overmolded component 130 is injected into the mold. The material is formed in the mold and forms an integral structure with the rotating shaft 120 and the rotor core assembly 110.

[0087] Furthermore, a plurality of magnetic cores 131 are provided in the overmolding component 130. Since the rotating shaft 120 can drive the overmolding component 130 to rotate, when the rotating shaft 120 rotates, the rotating shaft 120 can drive the plurality of magnetic cores 131 to rotate along with the rotating shaft 120. The magnetic cores 131 can form magnetic lines of force, and the magnetic lines of force can be cut while the magnetic cores 131 rotate along with the rotating shaft 120. Specifically, during the processing of the rotor assembly 100, the rotor, the rotor core assembly 110 and the plurality of magnetic cores 131 can be placed in a mold at the same time, and then the material for forming the overmolding component 130 is injected into the mold. The material is formed in the mold and forms an integrated structure with the rotating shaft 120, the rotor core assembly 110 and the plurality of magnetic cores 131, so as to achieve the fixation of the rotor core assembly 110 and the plurality of magnetic cores 131 by the overmolding component 130.

[0088] Furthermore, the overmolded assembly 130 is provided with an axially extending shaft cavity 132. The rotating shaft 120 is inserted through the shaft cavity 132, with at least a portion of the rotating shaft 120 located within the shaft cavity 132. The rotating shaft 120 can drive the overmolded assembly 130 to rotate. The rotor core assembly 110 is mounted on the outer periphery of the overmolded assembly 130. When the rotating shaft 120 drives the overmolded assembly 130 to rotate, the overmolded assembly 130 further drives the rotor core assembly 110 to rotate.

[0089] Furthermore, a gap 140 is provided between at least a portion of the rotating shaft 120 and the inner wall of the rotating shaft cavity 132. It is understandable that within the operating speed of the electrical equipment, when the natural frequency of the coupling between the rotor assembly 100 of the motor and the wind wheel of the electrical equipment is close to the electromagnetic excitation, resonance is likely to occur, thereby causing the electrical equipment to produce a large noise. In order to avoid the occurrence of the resonance phenomenon, it is necessary to reduce the natural frequency of the rotor assembly 100 to reduce the natural frequency of the coupling between the rotor assembly 100 and the fan blades. Providing a gap 140 between at least a portion of the rotating shaft 120 and the inner wall of the rotating shaft cavity 132 can effectively reduce the natural frequency of the rotor assembly 100, thereby avoiding the resonance phenomenon between the rotor assembly 100 and the fan blades in the electrical equipment, thereby reducing the noise of the electrical equipment.

[0090] By providing a gap 140 between at least a portion of the rotating shaft 120 and the inner wall of the rotating shaft cavity 132 , the natural frequency of the rotor assembly 100 can be reduced, thereby preventing the rotor assembly 100 from exciting a coupling mode with a fan blade in an electrical device, thereby reducing the noise of the electrical device.

[0091] Example 2:

[0092] In a specific embodiment based on the first embodiment, the overmolded assembly 130 includes a main body 133, the rotor core assembly 110 is connected to the main body 133, and the axial thickness of the main body 133 is H; the rotating shaft 120 is provided with a first adjustment groove 121, at least a portion of the wall surface of the first adjustment groove 121 is located within the gap 140, and the cross-sectional area of the position where the first adjustment groove 121 is provided on the rotating shaft 120 is S; the axial length of the gap 140 is L, the outer diameter of the rotor assembly 100 is D, the end surface of the main body 133 facing the first end of the rotating shaft 120 is the first end surface 134, and the axial distance between the first end of the rotating shaft 120 and the first end surface 134 is A, and H, L, D, A, and S satisfy the following relationship:

[0093] And L>0.

[0094] In this embodiment, the size of the gap 140 between the rotor and the inner wall of the rotor cavity is limited. Specifically, the axial length of the gap 140 is limited. It is understood that the gap 140 between the rotor and the inner wall of the rotor cavity will affect the natural frequency of the rotor assembly 100. Limiting the axial length of the gap 140 to a reasonable range can effectively reduce the natural frequency of the rotor assembly 100.

[0095] Furthermore, the dimensions associated with the axial length range of gap 140 are defined. The overmolded assembly 130 includes a main body 133, to which the rotor core assembly 110 is connected. The main body 133 has an axial thickness of H. The rotating shaft 120 is provided with a first adjustment slot 121, at least a portion of the wall of the first adjustment slot 121 being located within gap 140. The cross-sectional area of the location where the first adjustment slot 121 is provided on the rotating shaft 120 is S. The outer diameter of the rotor assembly 100 is D. The end surface of the main body 133 facing the first end of the rotating shaft 120 is a first end surface 134. The axial distance between the first end of the rotating shaft 120 and the first end surface 134 is A.

[0096] Furthermore, the length of the gap 140 between the rotor and the inner wall of the rotor cavity in the axial direction is L. The range of L is related to multiple dimensions in the rotor assembly 100. Specifically, L is related to A, H, D and S. H, L, D, A and S satisfy the following relationship:

[0097] And L>0. The unit of H, L, D, A is mm, and the unit of S is mm2 .

[0098] In one possible embodiment, the outer diameter D of the rotor assembly 100 is 44.4 mm, the axial thickness H of the main body 133 is 32.5 mm, the axial distance A between the first end of the rotating shaft 120 and the first end surface 134 is 77.75 mm, and the cross-sectional area S of the position where the first adjustment groove 121 of the rotating shaft 120 is provided is 13 mm. 2 The length L of the gap 140 between the rotor and the inner wall of the rotor cavity along the axial direction is 14 mm.

[0099] By limiting the range of the axial length L of the gap 140 between the rotor and the inner wall of the rotor cavity, the natural frequency of the rotor assembly 100 can be effectively reduced.

[0100] like Figure 1 As shown, further, the first end of the rotating shaft 120 can be connected to the driving motor, and the gap 140 is located on a side close to the first end of the rotating shaft 120 .

[0101] In this embodiment, the position at which the gap 140 is set is defined. Specifically, the rotating shaft 120 includes a first end and a second end. The first end of the rotating shaft 120 can be connected to the drive motor, and the gap 140 between the rotating shaft 120 and the cavity wall of the rotating shaft cavity 132 is located on the side close to the first end of the rotating shaft 120. It can be understood that the drive motor applies a driving torque to the first end of the rotating shaft 120 to enable the rotating shaft 120 to rotate, and the rotating shaft 120 then drives the overmolded component 130 to rotate, so that the portion of the overmolded component 130 close to the first end of the rotating shaft 120 vibrates more violently. In order to enable the gap 140 between the rotating shaft 120 and the inner wall of the rotating shaft cavity 132 to more effectively reduce the natural frequency of the rotor assembly 100, the present application sets the gap 140 on the side close to the first end of the rotating shaft 120, that is, the gap 140 is set on the side close to the drive motor, thereby improving the effect of the gap 140 in adjusting the natural frequency of the rotor assembly 100.

[0102] Example 3:

[0103] like Figure 1 and Figure 12 As shown, in a specific embodiment based on any of the above embodiments, the shaft cavity 132 includes a first mounting segment 135 and a second mounting segment 136, the inner wall of the first mounting segment 135 is tightly fitted with the shaft 120, the gap 140 is located in the second mounting segment 136, and the inner diameter of the second mounting segment 136 is greater than the maximum outer diameter of the shaft 120 located in the second mounting segment 136.

[0104] In this embodiment, the structure of the shaft cavity 132 is defined. The shaft cavity 132 has a variable diameter structure and specifically includes a first mounting section 135 and a second mounting section 136. The inner wall of the first mounting section 135 closely mates with the shaft 120. When the shaft 120 rotates, the shaft 120, through the closely mateable first mounting section 135, can drive the overmolded assembly 130 to rotate synchronously with the shaft 120, thereby driving the rotor core assembly 110 to rotate.

[0105] Furthermore, gap 140 is located within second mounting section 136. Compared to first mounting section 135, second mounting section 136 is closer to the first end of rotating shaft 120. The inner diameter of second mounting section 136 is greater than the maximum outer diameter of rotating shaft 120 at the point where it is located within second mounting section 136. This means that a certain distance remains between rotating shaft 120 and the inner wall of the second mounting end at any point within second mounting section 136. This effectively reduces the natural frequency of rotor assembly 100 through gap 140 between the inner wall of second mounting section 136 and rotating shaft 120.

[0106] Furthermore, to facilitate the formation of a gap 140 between the rotating shaft 120 and the inner wall of the rotating shaft cavity 132, a boss 125 is provided on the rotating shaft 120. The boss 125 is disposed on the outer wall of the rotating shaft 120 within the second mounting section 136. Specifically, during the processing of the rotor assembly 100, after the rotating shaft 120 is placed in the mold and before the material of the overmolded component 130 is injected into the mold, a support sleeve is placed on the rotating shaft 120. The boss 125 is used to limit the support sleeve. In this way, the support sleeve can form a gap 140 between the inner wall of the rotating shaft cavity 132 of the overmolded component 130 and the rotating shaft 120. After the overmolded component 130 is formed, the support sleeve is removed. It is understandable that if the support sleeve is not placed on the rotating shaft 120 during the injection molding process, the portion of the rotating shaft 120 located in the mold will be tightly fitted with the overmolded component 130, and the gap 140 between the rotating shaft 120 and the overmolded component 130 cannot be formed. In order to enable at least part of the rotating shaft 120 to be separated from the overmolded component 130 and form a gap 140 between the two, the present application provides a boss 125 on the rotating shaft 120, and the boss 125 is used to limit the support sleeve, so that the support sleeve can isolate the material of the overmolded component 130 from the rotating shaft 120 to form a gap 140 between the rotating shaft 120 and the overmolded component 130.

[0107] By setting the inner diameter of the second mounting section 136 to be larger than the maximum outer diameter of the rotating shaft 120 located in the second mounting section 136, a distance can be left between the rotating shaft 120 and the inner wall of the second mounting section 136, thereby reducing the natural frequency of the rotor assembly 100, avoiding resonance between the rotor assembly 100 and the fan blades in the electrical equipment, and reducing the noise of the electrical equipment.

[0108] Example 4:

[0109] like Figure 1 and Figure 13 As shown, in a specific embodiment based on any of the above embodiments, the rotating shaft 120 is further provided with a second adjustment groove 122, the second adjustment groove 122 is located in the first mounting section 135, the wall of the second adjustment groove 122 is provided with a first connecting member, and the inner wall of the first mounting section 135 is provided with a second connecting member, and the first connecting member can be adapted to the second connecting member so that the rotating shaft 120 can drive the overmolded component 130 to rotate.

[0110] In this embodiment, to enable the rotating shaft 120 to rotate the overmolded assembly 130, a first connecting member and a second connecting member are provided on the rotating shaft 120 and the overmolded assembly 130. Specifically, the rotating shaft 120 is provided with a second adjustment groove 122 that is adapted to the first mounting section 135 of the rotating shaft cavity 132. Because the inner diameter of the first mounting section 135 is smaller than that of the second mounting section 136, the provision of the second adjustment groove 122 on the rotating shaft 120 enables the rotating shaft 120 to conform to the inner wall of the rotating shaft cavity 132.

[0111] Furthermore, a first connector is provided on the wall surface of the second adjustment groove 122, and a second connector is provided on the inner wall of the first mounting section 135, and the first connector and the second connector are adapted to each other. In a possible embodiment, the first connector is a protruding structure, and the second connector is a groove structure adapted to the protruding structure. The coordination of the protruding structure and the groove structure can realize the synchronous rotation of the rotating shaft 120 and the overmolding component 130. Specifically, during the processing of the rotor assembly 100, the rotating shaft 120 is placed in the mold. Since the wall surface of the second adjustment groove 122 of the rotating shaft 120 is provided with a protruding first connector, when the material for forming the overmolding component 130 is injected into the mold, the material is formed by adhering to the surface of the mold and the rotating shaft 120, thereby naturally forming a second connector with a groove structure, and making the second connector closely fit with the first connector.

[0112] Furthermore, by providing a second connecting groove on the rotating shaft 120 , the natural frequency of the overmolded component 130 can be further reduced.

[0113] By setting a first connecting member on the wall surface of the second adjustment groove 122 of the rotating shaft 120, and setting a second connecting member adapted to the first connecting member on the wall surface of the first installation section 135 of the rotating shaft cavity 132, the rotating shaft 120 can drive the overmolded component 130 to rotate synchronously through the cooperation of the first connecting member and the second connecting member.

[0114] Furthermore, the first connecting member and the second connecting member are constructed to be knurled or edged.

[0115] In this embodiment, the structures of the first and second connecting members are defined. Specifically, the first and second connecting members are knurled or ribbed. The knurled and ribbed structures are easy to process and have high connection strength, thereby reducing the production cost of the rotor assembly 100 and improving the connection reliability between the rotating shaft 120 and the overmolded assembly 130.

[0116] Specifically, during the production of rotor assembly 100, a knurled or ribbed structure is first machined on the wall surface of the rotor's second adjustment groove 122, and then the rotating shaft 120 is placed in a mold. Material for forming overmolded assembly 130 is then injected into the mold. The material flows along the knurled or ribbed surface of rotating shaft 120 and adheres tightly to it, thereby forming a knurled or ribbed structure on the inner wall of first mounting section 135 that matches the knurled or ribbed structure of rotating shaft 120. The knurled or ribbed structure on first mounting section 135 cooperates with the knurled or ribbed structure on second adjustment groove 122, achieving the technical effect of rotating shaft 120 driving overmolded assembly 130 to rotate.

[0117] Embodiment 5:

[0118] like Figure 4 、 Figure 5 and Figure 13 As shown, in a specific embodiment based on any of the above embodiments, the rotating shaft 120 is provided with at least one third adjustment groove 123 along the axial direction.

[0119] In this embodiment, the structure of the rotating shaft 120 is further defined. The rotating shaft 120 is provided with at least one third adjustment slot 123 along its axial direction. As can be understood, the adjustment slot can reduce the natural frequency of the rotor assembly 100. By providing the third adjustment slot 123 on the rotating shaft 120, the natural frequency of the rotor assembly 100 can be further reduced. Furthermore, the provision of the third adjustment slot 123 can reduce the weight of the rotating shaft 120, and thereby the weight of the rotor assembly 100, facilitating a lightweight design for the product.

[0120] Example 6:

[0121] like Figure 8 As shown, in a specific embodiment based on any of the above embodiments, the rotor core assembly 110 includes: a plurality of sub-cores 111; the overmolded assembly 130 is provided with a plurality of core slots 137 along the circumferential direction, and the plurality of core slots 137 are arranged in a one-to-one correspondence with the plurality of sub-cores 111, and any sub-core 111 is located in the core slot 137.

[0122] In this embodiment, the structure of the rotor core assembly 110 is defined. The rotor core assembly 110 includes multiple sub-cores 111. To facilitate installation and positioning of the sub-cores 111, a plurality of core slots 137 are provided in the overmolding assembly 130. Specifically, the core slots 137 are arranged circumferentially around the overmolding assembly 130. The number of core slots 137 is the same as the number of sub-cores 111. The core slots 137 correspond one-to-one to the sub-cores 111, and any sub-core 111 is located within a corresponding core slot 137.

[0123] In one possible embodiment, the plurality of sub-cores 111 and the overmolded component 130 are integrally formed during the injection molding process. Specifically, during the processing of the rotor assembly 100, the plurality of sub-cores 111 and the rotating shaft 120 are first placed in the mold, with the rotating shaft 120 located in the central area of the mold and the plurality of sub-cores 111 close to the circumferential edge of the mold. The material for forming the overmolded component 130 is then injected into the mold. During the flow process, the material is tightly attached to the rotating shaft 120 and the plurality of sub-cores 111 and gradually solidifies to form the overmolded component 130. The overmolded component 130 after molding forms a core slot 137 for accommodating the sub-cores 111.

[0124] Embodiment seven:

[0125] like Figure 9 As shown, in a specific embodiment based on any of the above embodiments, the sub-core 111 assembly further includes: a mounting member 112 , and the plurality of sub-cores 111 are sequentially connected to the circumferential side of the mounting member 112 .

[0126] In this embodiment, the structure of the rotor core assembly 110 is further defined. The rotor core assembly 110 also includes a mounting member 112, and a plurality of sub-cores 111 are sequentially connected to the circumferential side of the mounting member 112. Specifically, the mounting member 112 can be constructed as an annular structure, and the plurality of sub-cores 111 are evenly distributed along the circumference of the annular mounting member 112. Specifically, when processing the rotor assembly 100, the rotor core assembly 110 and the rotating shaft 120 are first placed in a mold, and the rotating shaft 120 is placed in the area enclosed by the annular mounting member 112. Then, the material for forming the overmolding assembly 130 is injected into the mold, and the liquid material flows in the mold and adheres to the wall surfaces of the mounting member 112, the sub-cores 111 and part of the rotating shaft 120. After the liquid material solidifies, the overmolding assembly 130 is tightly adhered to the wall surfaces of the mounting member 112 and the sub-cores 111 to fix the rotor core assembly 110.

[0127] Providing mounting members 112 within rotor core assembly 110 not only enhances the overall strength of rotor core assembly 110 but also allows for securing the multiple sub-cores 111 via mounting members 112, thereby limiting the relative positions of the sub-cores 111. Furthermore, providing mounting members 112 within rotor core assembly 110 increases the contact area between overmolding assembly 130 and rotor core assembly 110, thereby improving the reliability of the connection between rotor core assembly 110 and overmolding assembly 130.

[0128] Embodiment 8:

[0129] like Figure 6 、 Figure 7 、 Figure 10 and Figure 11 As shown, in a specific embodiment based on any of the above embodiments, the overmolded component 130 is provided with a plurality of magnetic core slots 138 along the circumferential direction, the plurality of magnetic cores 131 are arranged in a one-to-one correspondence with the plurality of magnetic core slots 138 , and any magnetic core 131 is installed in the magnetic core slot 138 .

[0130] In this embodiment, to secure the magnetic core 131, a plurality of magnetic core slots 138 are further provided in the overmolding assembly 130. Specifically, the number of magnetic core slots 138 is the same as the number of magnetic cores 131, and the plurality of magnetic core slots 138 are provided in a one-to-one correspondence with the plurality of magnetic cores 131. The magnetic core slots 138 can be provided between two adjacent core slots 137, and the plurality of magnetic core slots 138 are evenly distributed along the circumference of the overmolding assembly 130, with any magnetic core 131 installed in a magnetic core slot 138. In one possible embodiment, the magnetic core 131 and the sub-core 111 are spaced apart along the circumference of the overmolding assembly 130.

[0131] In one possible embodiment, during the manufacturing process of rotor assembly 100, multiple sub-cores 111 and multiple magnetic cores 131 are first spaced apart along the circumference of a mold, with a certain distance between the magnetic cores 131 and the mold. The rotating shaft 120 is then placed in the center of the mold. The material used to form the overmolded assembly 130 is then injected into the mold. This material is in a liquid state upon injection and flows along the surfaces of the magnetic cores 131, sub-cores 111, and rotating shaft 120 until the liquid material solidifies, completing the overmolded assembly 130. This naturally forms the magnetic core slots 138, the rotating shaft cavity 132, and the core slots 137 within the overmolded assembly 130.

[0132] By providing a plurality of magnetic core slots 138 along the circumferential direction in the overmolded component 130 , the magnetic core 131 can be fixed through the magnetic core slots 138 , so that the rotor assembly 100 can work normally.

[0133] Furthermore, the overmolded component 130 further includes a fixing sleeve 150 . The end surface of the main body 133 facing away from the first end of the rotating shaft 120 is a second end surface 139 . The fixing sleeve 150 is connected to the second end surface 139 and is sleeved on the rotating shaft 120 .

[0134] In this embodiment, the structure of the overmolded assembly 130 is further defined. The overmolded assembly 130 includes a fixing sleeve 150, which is adapted to fit over the rotating shaft 120 to enhance its securement. Specifically, the end face of the main body 133 of the overmolded assembly 130, facing away from the first end of the rotating shaft 120, is the second end face 139. The fixing sleeve 150 is connected to the second end face 139 of the overmolded assembly 130. Specifically, the fixing sleeve 150 is located at the end of the main body 133 of the overmolded assembly 130 that is away from the drive motor. The rotating shaft 120 is inserted into the rotating shaft cavity 132 of the overmolded assembly 130, and the fixing sleeve 150 is mounted on the portion of the rotating shaft 120 that extends beyond the main body 133 of the overmolded assembly 130. It is understood that the larger the area of connection between the rotating shaft 120 and the overmolded assembly 130, the more secure the connection between the rotating shaft 120 and the overmolded assembly 130, and the relatively more stable the relationship between the rotating shaft 120 and the overmolded assembly 130. By providing a fixing sleeve 150 sleeved on the rotating shaft 120 on the second end surface 139 of the overmolded component 130 , the contact area between the overmolded component 130 and the rotating shaft 120 can be further increased, thereby further improving the connection reliability between the rotating shaft 120 and the overmolded component 130 .

[0135] In a possible embodiment, knurling is provided on the inner wall of the fixing sleeve 150, and knurling that is adapted to the knurling of the fixing sleeve 150 is also provided on the rotating shaft 120 located in the fixing sleeve 150. Through the cooperation of the knurling on the rotating shaft 120 and the fixing sleeve 150, the connection reliability between the rotating shaft 120 and the overmolded component 130 can be improved, and the relative stability between the rotating shaft 120 and the overmolded component 130 can be further improved.

[0136] like Figure 2 and Figure 5 As shown, further, the rotating shaft 120 is provided with a limiting plane 124, which is close to the first end of the rotating shaft 120. The limiting plane 124 is used to cooperate with the driving motor so that the driving motor can drive the rotating shaft 120 to rotate.

[0137] In this embodiment, a limiting plane 124 is further provided on the rotating shaft 120. When the drive motor is connected to the rotating shaft 120, the limiting plane 124 cooperates with the drive motor to enable the drive motor to drive the rotating shaft 120. Specifically, the limiting plane 124 is located near the first end of the rotating shaft 120, to which the drive motor is connected. When the rotating shaft 120 is connected to the drive motor, the limiting plane 124 on the rotating shaft 120 is inserted into the drive motor and cooperates with the drive motor. The driving torque of the drive motor acts on the limiting plane 124, thereby achieving the technical effect of the drive motor driving the rotating shaft 120 to rotate.

[0138] like Figure 1 As shown, the rotor assembly 100 further includes: a first bearing 160, which is sleeved on the rotating shaft 120, and the first bearing 160 is located between the limiting plane 124 and the overmolded assembly 130; a second bearing 170, which is sleeved on the second end of the rotating shaft 120 away from the first end.

[0139] In this embodiment, the structure of the rotor assembly 100 is further defined. A first bearing 160 and a second bearing 170 are provided within the rotor assembly 100. The first bearing 160 and the second bearing 170 are respectively mounted on the two sides of the rotating shaft 120 extending beyond the overmolded assembly 130. Specifically, the first bearing 160 is mounted on the rotating shaft 120, positioned between the limiting plane 124 and the overmolded assembly 130. The second bearing 170 is mounted on the rotating shaft 120, positioned at the second end of the rotating shaft 120, facing away from the first end. The first bearing 160 and the second bearing 170 are respectively mounted on the two sides of the rotating shaft 120 extending beyond the overmolded assembly 130, allowing the rotating shaft 120 to be mounted and secured, ensuring that the rotating shaft 120 can drive the overmolded assembly 130 to rotate stably under the drive motor.

[0140] Embodiment 9:

[0141] The second aspect of the present invention further provides an electric motor, comprising the rotor assembly 100 provided in the first aspect of the present invention.

[0142] The motor provided in the second aspect of the present invention includes the rotor assembly 100 provided in the first aspect of the present invention, and thus has all the beneficial effects of the rotor assembly 100 .

[0143] Embodiment 10:

[0144] The third aspect of the present invention further provides an electrical device, comprising the rotor assembly 100 provided in the first aspect of the present invention, or the motor provided in the second aspect of the present invention.

[0145] The electrical device provided in the third aspect of the present invention includes the rotor assembly 100 provided in the first aspect of the present invention or the motor provided in the second aspect of the present invention, and thus has all the beneficial effects of the rotor assembly 100 or the motor.

[0146] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0147] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0148] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that: include: rotor core assembly; a rotating shaft passing through the rotor core assembly; an overmolded assembly located between the rotor core assembly and the rotating shaft, the overmolded assembly being provided with a plurality of magnetic cores and an axially extending rotating shaft cavity, at least a portion of the rotating shaft being located within the rotating shaft cavity, and the rotor core assembly being mounted on an outer circumference of the overmolded assembly; A gap is provided between at least a portion of the rotating shaft and the inner wall of the rotating shaft cavity; The overmolded component includes a main body, the rotor core component is connected to the main body, and the main body has an axial thickness of H; The rotating shaft is provided with a first adjustment groove, at least a portion of the wall surface of the first adjustment groove is located in the gap, and the cross-sectional area of the position where the first adjustment groove is provided on the rotating shaft is S; The length of the gap in the axial direction is L, the outer diameter of the rotor assembly is D, the end surface of the main body facing the first end of the rotating shaft is the first end surface, and the distance between the first end of the rotating shaft and the first end surface in the axial direction is A. H, L, D, A and S satisfy the following relationship: And L>

0.

2. The rotor assembly according to claim 1, wherein: The first end of the rotating shaft can be connected to a driving motor, and the gap is located on a side close to the first end of the rotating shaft.

3. The rotor assembly according to claim 1, wherein: The shaft cavity includes a first mounting section and a second mounting section. The inner wall of the first mounting section is tightly fitted with the shaft. The gap is located in the second mounting section. The inner diameter of the second mounting section is larger than the maximum outer diameter of the shaft located in the second mounting section.

4. The rotor assembly according to claim 3, wherein: The rotating shaft is also provided with a second adjustment groove, which is located in the first installation section. The wall of the second adjustment groove is provided with a first connecting piece, and the inner wall of the first installation section is provided with a second connecting piece. The first connecting piece can be adapted to the second connecting piece so that the rotating shaft can drive the overmolded component to rotate.

5. The rotor assembly according to claim 4, wherein: The first connecting member and the second connecting member are configured as knurled or edged.

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: The rotating shaft is provided with at least one third adjusting groove along the axial direction.

7. The rotor assembly according to any one of claims 1 to 5, characterized in that: The rotor core assembly comprises: Multiple sub-cores; The overmolded component is provided with a plurality of core slots along the circumferential direction. The plurality of core slots are arranged in one-to-one correspondence with the plurality of sub-cores, and any of the sub-cores is located in the core slot.

8. The rotor assembly according to claim 7, wherein: The rotor core assembly further comprises: The plurality of sub-cores are sequentially connected to the peripheral side of the mounting member.

9. The rotor assembly according to any one of claims 1 to 5, characterized in that: The overmolded component is provided with a plurality of magnetic core slots along the circumferential direction. The plurality of magnetic cores are arranged in a one-to-one correspondence with the plurality of magnetic core slots, and any of the magnetic cores is installed in the magnetic core slot.

10. The rotor assembly according to claim 1, wherein: The overmolded component further comprises: The fixing sleeve is configured such that the end face of the main body facing away from the first end of the rotating shaft is the second end face, the fixing sleeve is connected to the second end face, and the fixing sleeve is sleeved on the rotating shaft.

11. The rotor assembly according to claim 2, wherein: The rotating shaft is provided with a limiting plane, the limiting plane is close to the first end of the rotating shaft, and the limiting plane is used to cooperate with the driving motor so that the driving motor can drive the rotating shaft to rotate.

12. The rotor assembly according to claim 11, wherein: Also includes: a first bearing, sleeved on the rotating shaft, wherein the first bearing is located between the limiting plane and the overmolded component; The second bearing is sleeved on the second end of the rotating shaft away from the first end.

13. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: include: The rotor assembly according to any one of claims 1 to 12; or The motor as claimed in claim 13.

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