Rotor assembly, motor, fan and electrical equipment

Abstract

The invention provides a rotor assembly, a motor, a fan and electrical equipment, and the rotor assembly comprises a rotor iron core which is provided with a shaft hole and a plurality of installation grooves which are arranged around the shaft hole at intervals, and the interior of the shaft hole is provided with a first positioning part; the rotating shaft is mounted in the shaft hole, a second positioning part is arranged on the rotating shaft, and the first positioning part is matched with the second positioning part; the plurality of magnetic parts are arranged in the plurality of mounting grooves; wherein the rotating shaft is an integrated plastic shaft; or the rotating shaft comprises a core shaft and a plastic part formed on the radial outer side of the core shaft, and the core shaft is made of a metal material or a plastic material.

Description

Technical Field

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

[0002] At present, with the mature development of air-conditioning fan motors, the reduction of motor costs has encountered certain bottlenecks. It is difficult to further achieve motor cost reduction using traditional methods. Among them, the traditional motor shaft uses a steel shaft, which has low material cost and high processing fee, making it difficult to reduce the cost of the steel shaft. In addition, due to the high torsional stiffness of the steel shaft, there is a resonance problem when used on the non-shock-absorbing external unit wind wheel, which needs to be slotted in the steel shaft to solve the problem, and slotting will increase the cost of the shaft. Summary of the Invention

[0003] The present invention aims to at least solve or improve the technical problem of excessively high cost of a motor shaft in the prior art.

[0004] To this end, a first aspect of the present invention provides a rotor assembly.

[0005] A second aspect of the present invention provides an electric motor.

[0006] A third aspect of the present invention provides a fan.

[0007] A fourth aspect of the present invention provides an electrical device.

[0008] In view of this, according to a first aspect of the present invention, the present invention proposes a rotor assembly, comprising: a rotor core, the rotor core is provided with an axial hole and a plurality of mounting grooves arranged at intervals around the axial hole, a first positioning portion is provided in the axial hole; a rotating shaft, installed in the axial hole, a second positioning portion is provided on the rotating shaft, the first positioning portion and the second positioning portion cooperate with each other; a plurality of magnetic parts, arranged in a plurality of mounting grooves; wherein the rotating shaft is an integrated plastic shaft; or the rotating shaft includes a core shaft and a plastic portion molded on the radial outside of the core shaft, and the core shaft is made of metal material or plastic material.

[0009] The rotor assembly proposed in the present invention includes a rotor core, a rotating shaft and a magnetic part. The rotor core is provided with an axial hole, a first positioning portion and multiple mounting grooves. The rotating shaft is installed in the axial hole, and the magnetic part is installed in the mounting groove. Then, the stator assembly can drive the rotor core to rotate through the magnetic part. The first positioning portion is provided on the inner circumference side of the axial hole, and the second positioning portion is provided on the outer circumference side of the rotating shaft. The first positioning portion and the second positioning portion cooperate to achieve synchronous rotation of the rotor core and the rotating shaft.

[0010] The rotating shaft is an integrated plastic shaft. Alternatively, the rotating shaft includes a core shaft and a plastic portion formed radially outward of the core shaft. The core shaft reduces the possibility of shrinkage and deformation of the plastic portion during injection molding, reduces cooling events, and improves the production efficiency of the rotating shaft.

[0011] The core shaft can be made of a metal material to improve the strength of the shaft, or the core shaft can be made of a plastic material to reduce production costs.

[0012] Since at least part of the rotating shaft is made of plastic, the cost of the rotor assembly is reduced, and the damping coefficient of the rotating shaft is increased, the torsional stiffness is reduced, and its low torsional stiffness is used to achieve the transfer of the motor resonance frequency, thereby improving the resonance problem on the non-vibration-damped external unit wind wheel and improving the vibration and noise performance of the fan.

[0013] In addition, the rotor assembly in the above technical solution provided by the present invention may also have the following additional technical features:

[0014] In some embodiments, optionally, the core shaft and the plastic part are both stepped structures, the second positioning portion is arranged at the stepped position where the diameter of the plastic part is the largest, and the stepped positions of the core shaft and the plastic part match; or the plastic part is a stepped structure, the second positioning portion is arranged at the stepped position where the diameter of the plastic part is the largest, and the core shaft is a constant diameter columnar structure.

[0015] In this embodiment, both the core shaft and the plastic portion have a stepped structure, reducing the production cost of the shaft and facilitating the assembly and mating of the shaft with the rotor core and other components. The stepped positions of the core shaft and the plastic portion match, ensuring approximately the same shaft wall thickness and reducing the risk of shaft shrinkage and deformation. The second locating portion is positioned at the stepped position where the plastic portion has the largest diameter, facilitating the mating of the shaft with the rotor core.

[0016] Alternatively, the plastic portion has a stepped structure, facilitating the assembly and mating of the rotating shaft and rotor core, as well as other components. Furthermore, the core shaft has a constant diameter cylindrical structure, reducing its processing cost and the material input required for the rotating shaft. The second positioning portion is located at the stepped position where the plastic portion has the largest diameter, facilitating the mating of the rotating shaft and rotor core.

[0017] In some embodiments, optionally, when both the core shaft and the plastic part are stepped structures, the difference between the diameter of the core shaft and the diameter of the plastic part ranges from 2 mm to 6 mm; or when the plastic part is a stepped structure and the core shaft is a constant diameter cylindrical structure, the difference between the diameter of the core shaft and the minimum diameter of the plastic part ranges from 2 mm to 6 mm.

[0018] In this embodiment, when both the core shaft and the plastic part are stepped structures, the difference between the diameter of the core shaft and the diameter of the plastic part at corresponding positions of the core shaft and the plastic part ranges from 2 mm to 6 mm, so that the wall thickness of the plastic part is thinner, from 1 mm to 3 mm, reducing the cooling time of the plastic part, facilitating the uniformity of the plastic part, and reducing the risk of deformation of the plastic part.

[0019] Or when the plastic part has a stepped structure and the core shaft has a constant diameter cylindrical structure, on the cross section perpendicular to the axial direction of the rotating shaft, the difference between the diameter of the core shaft and the minimum diameter of the plastic part ranges from 2 mm to 6 mm, so that the minimum wall thickness of the plastic part is thinner, from 1 mm to 3 mm, reducing the cooling time of the plastic part, facilitating the uniformity of the plastic part, and reducing the risk of deformation of the plastic part.

[0020] In some embodiments, optionally, the plastic portion and the core shaft are insert-molded.

[0021] In this embodiment, the plastic part and the core shaft are insert-molded, which improves the connection strength between the plastic part and the core shaft and reduces the risk of delamination between the plastic part and the core shaft.

[0022] In some embodiments, optionally, the cooperation between the first positioning portion and the second positioning portion is a flat fit or a keyway fit.

[0023] In this embodiment, the first positioning portion and the second positioning portion are matched in a flat position or a keyway manner, thereby improving the synchronous rotation effect of the rotor core and the shaft and ensuring the function of the motor.

[0024] In some embodiments, optionally, the plastic part and the rotor core are at least one of interference fit, adhesive fit, and insert molding fit.

[0025] In this embodiment, the plastic part and the rotor core are at least one of interference fit, adhesive fit and insert injection molding fit, thereby improving the connection strength between the shaft and the rotor core, improving the effect of synchronous rotation of the rotor core and the shaft, and ensuring the function of the motor.

[0026] In some embodiments, optionally, it further includes: a bearing, which is arranged on the rotating shaft, the bearing is located on at least one side of the rotor core, the rotating shaft is a stepped shaft structure, and the stepped surfaces of the bearing and the rotating shaft are against each other.

[0027] In this embodiment, the rotor assembly also includes a bearing, which is sleeved on the rotating shaft, and the bearing is located on at least one side of the rotor core, thereby providing support for the rotating shaft and improving the rotation stability of the rotating shaft. In addition, the rotating shaft has a stepped shaft structure, and the stepped surfaces of the bearing and the rotating shaft offset each other, reducing the stress concentration caused by the retaining ring groove set on the rotating shaft, thereby improving the reliability of the rotor assembly.

[0028] In some embodiments, optionally, the rotor core includes: a plurality of rotor blocks, the plurality of rotor blocks surround the rotating shaft, and mounting grooves are formed between adjacent rotor blocks; a shaft sleeve, the shaft sleeve is installed in the shaft hole and sleeved on the outside of the rotating shaft, and the first positioning portion is arranged in the shaft sleeve.

[0029] In this embodiment, the rotor core includes a sleeve and multiple rotor blocks. The rotor blocks are arranged on the circumferential side of the sleeve. The rotor blocks surround an axial hole. The rotating shaft is arranged in the axial hole. The first positioning portion is arranged in the rotating sleeve. The rotor core includes multiple parts, thereby reducing the production difficulty of the rotor core and reducing the production cost of the rotor core.

[0030] In some embodiments, optionally, the rotor assembly includes: a plastic-coated portion, which is fixedly connected to the rotor core, the rotating shaft, and the magnetic component by injection molding.

[0031] In this embodiment, the rotor assembly also includes a plastic-coated portion, which is fixedly connected to the rotor core, the rotating shaft and the magnetic parts by injection molding, thereby improving the connection strength of the rotating shaft, the rotor core and the multiple magnetic parts, and reducing the risk of separation of the rotating shaft, the rotor core and the multiple magnetic parts.

[0032] According to a second aspect of the present invention, the present invention provides an electric motor, comprising: a rotor assembly as provided in the embodiment of the first aspect.

[0033] The motor proposed in the present invention includes the rotor assembly proposed in the first embodiment, and therefore has all the beneficial effects of the rotor assembly proposed in the first embodiment, which will not be listed one by one here.

[0034] According to a third aspect of the present invention, the present invention provides a wind turbine, comprising: a rotor assembly as provided in the embodiment of the first aspect; or a motor as provided in the embodiment of the second aspect.

[0035] The motor proposed in the present invention includes the rotor assembly proposed in the first embodiment or the motor proposed in the second embodiment, and therefore has all the beneficial effects of the rotor assembly proposed in the first embodiment or the motor proposed in the second embodiment, which will not be listed one by one here.

[0036] According to a fourth aspect of the present invention, the present invention proposes an electrical device, comprising: a rotor assembly as proposed in the embodiment of the first aspect; or a motor as proposed in the embodiment of the second aspect; or a fan as proposed in the embodiment of the third aspect.

[0037] The electrical equipment proposed in the present invention includes the rotor assembly proposed in the first embodiment or the motor proposed in the second embodiment or the fan proposed in the third embodiment, and therefore has all the beneficial effects of the rotor assembly proposed in the first embodiment or the motor proposed in the second embodiment or the fan proposed in the third embodiment, which are no longer listed one by one here.

[0038] 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

[0039] 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:

[0040] Figure 1 An exploded view of a rotor assembly provided by one embodiment of the present invention is shown;

[0041] Figure 2 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0042] Figure 3 A schematic structural diagram of a rotor core and a plastic-coated portion in a rotor assembly provided by one embodiment of the present invention is shown;

[0043] Figure 4 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0044] Figure 5 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0045] Figure 6 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0046] Figure 7 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0047] Figure 8 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0048] Figure 9 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0049] Figure 10 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0050] Figure 11 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0051] Figure 12 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0052] Figure 13 An exploded view of a rotor assembly provided by one embodiment of the present invention is shown;

[0053] Figure 14 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0054] Figure 15 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0055] Figure 16 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0056] Figure 17 shows a cross-sectional view of a rotor assembly provided by one embodiment of the present invention;

[0057] Figure 18 A schematic structural diagram of a rotating shaft in a rotor assembly provided by one embodiment of the present invention is shown;

[0058] Figure 19 A schematic structural diagram of a rotating shaft and a core shaft in a rotor assembly provided by one embodiment of the present invention is shown;

[0059] Figure 20 A schematic structural diagram of a core shaft in a rotor assembly provided by one embodiment of the present invention is shown;

[0060] Figure 21 A schematic structural diagram of a core shaft in a rotor assembly provided by one embodiment of the present invention is shown.

[0061] in, Figures 1 to 21 The corresponding relationship between the reference numerals and component names is as follows:

[0062] 100 rotor assembly, 110 rotor core, 112 shaft hole, 114 first positioning portion, 116 mounting groove, 118 shaft sleeve, 120 rotor block, 130 rotating shaft, 132 second positioning portion, 134 stepped surface, 136 core shaft, 138 plastic portion, 140 magnetic component, 150 plastic-coated portion, 170 bearing. DETAILED DESCRIPTION

[0063] 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.

[0064] 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.

[0065] Refer to the following Figures 1 to 21 The rotor assembly 100, motor, fan and electrical equipment provided according to some embodiments of the present invention are described.

[0066] like Figures 1 to 19As shown, according to the first aspect of the present invention, the present invention provides a rotor assembly 100, comprising: a rotor core 110, a magnetic member 140 and a rotating shaft 130, as shown in FIG. Figure 3 As shown, the rotor core 110 is provided with an axial hole 112 and a plurality of mounting slots 116. The plurality of mounting slots 116 are arranged around the axial hole 112, and adjacent mounting slots 116 are arranged at intervals. A first positioning portion 114 is provided in the axial hole 112, and the rotating shaft 130 is installed in the axial hole 112. A second positioning portion 132 is provided on the rotating shaft 130. The first positioning portion 114 and the second positioning portion 132 cooperate with each other. A plurality of magnetic members 140 are provided in the plurality of mounting slots 116. The magnetic members 140 and the mounting slots 116 can be arranged in a one-to-one correspondence.

[0067] The rotating shaft 130 is an integrated plastic shaft.

[0068] Or, as Figure 1 、 Figure 2 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 13 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 19 As shown, the rotating shaft 130 includes a core shaft 136 and a plastic portion 138 formed on the radial outer side of the core shaft 136 . The core shaft 136 is made of a metal material or a plastic material.

[0069] The rotating shaft 130 is an integrated plastic shaft.

[0070] Alternatively, the rotating shaft 130 includes a core shaft 136 and a plastic portion 138 formed radially outside the core shaft 136. The core shaft 136 is used to reduce the possibility of shrinkage and deformation of the plastic portion 138 during injection molding, and reduce cooling events, thereby improving the production efficiency of the rotating shaft.

[0071] The rotating shaft 130 includes a plastic portion 138 and a core shaft 136 arranged on the inner side of the plastic portion 138. The plastic portion 138 is coated on the radial outer side of the core shaft 136. The extension direction of the core shaft 136 and the plastic portion 138 is the same. When a single plastic shaft is injection-molded, due to the thickness of the single injection molding material, a long cooling time is required in the mold to ensure that the temperature difference between the core temperature and the surface temperature of the plastic shaft is low, thereby avoiding further shrinkage and deformation after demolding. This slows down the injection molding cycle. The core shaft 136 is used to reduce the possibility of shrinkage and deformation of the rotating shaft 130 during injection molding. In addition, the material input of the rotating shaft 130 is reduced, the cooling time is reduced, and the production efficiency of the rotating shaft 130 is improved.

[0072] Optionally, the plastic portion 138 and the mandrel 136 are the same length.

[0073] Optionally, the core shaft 136 is made of plastic material, and the core is first injection molded through a process, and then the shaft 130 is injection molded twice as an insert. In this way, the material thickness becomes thinner each time, which reduces the injection time and the risk of shrinkage and deformation after demolding.

[0074] Optionally, the core shaft 136 is made of metal material, which can reduce the thickness of the injection molded material of the rotating shaft 130. On the one hand, it can reduce the temperature difference on the surface of the core during injection molding, improve the cycle time, and reduce costs. On the other hand, it can reduce the risk of shrinkage and deformation of the rotating shaft 130. At the same time, the core shaft 136 made of metal material can improve the overall strength and rigidity of the rotating shaft 130, thereby improving product reliability.

[0075] The rotor assembly 100 provided by the present invention includes a rotor core 110, a rotating shaft 130 and a magnetic part 140. The rotor core 110 is provided with an axial hole 112, a first positioning portion 114 and a plurality of mounting grooves 116. The rotating shaft 130 is installed in the axial hole 112, and the magnetic part 140 is installed in the mounting groove 116. Then, the stator assembly can drive the rotor core 110 to rotate through the magnetic part 140. The first positioning portion 114 is provided on the inner peripheral side of the axial hole 112, and the second positioning portion 132 is provided on the outer peripheral side of the rotating shaft 130. The first positioning portion 114 and the second positioning portion 132 cooperate to achieve synchronous rotation of the rotor core 110 and the rotating shaft 130.

[0076] The core shaft 136 may be made of a metal material to improve the strength of the rotating shaft 130 , or the core shaft 136 may be made of a plastic material to reduce production costs.

[0077] Since at least a portion of the rotating shaft 130 is made of plastic, the cost of the rotor assembly 100 is reduced. In addition, the damping coefficient of the rotating shaft 130 is increased, and the torsional stiffness is reduced. The low torsional stiffness is then used to achieve the transfer of the motor resonance frequency, thereby improving the resonance problem on the non-vibration-damped external unit wind wheel and improving the vibration and noise performance of the fan.

[0078] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 12 、 Figure 14 and Figure 18As shown, the rotor assembly 100 provided by the present invention adopts a rotating shaft 130 and a rotor core 110. The rotating shaft 130 is a solid structure and is at least partially made of plastic, which can be processed by an injection molding process. The processing cost of the rotating shaft 130 is low compared to the processing cost of a pure metal shaft. The low process cost of the rotating shaft 130 is used to reduce the overall cost of the shaft. The rotating shaft 130 has low stiffness, and its low torsional stiffness can be used to improve the resonance problem on the non-shock-absorbing air conditioner outdoor unit impeller. At the same time, the rotor assembly 100 fully considers manufacturability and reliability, and has the characteristics of good manufacturability, high reliability and excellent performance.

[0079] In some embodiments, optionally, as Figure 8 、 Figure 9 and Figure 15 As shown, the core shaft 136 and the plastic part 138 are both stepped structures, the second positioning portion 132 is arranged at the stepped position where the diameter of the plastic part 138 is the largest, and the stepped positions of the core shaft 136 and the plastic part 138 match; or as shown Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 16 As shown, the plastic portion 138 is a stepped structure, the second positioning portion 132 is disposed at the stepped position where the diameter of the plastic portion 138 is the largest, and the core shaft 136 is a columnar structure with a constant diameter.

[0080] In this embodiment, if Figure 8 、 Figure 9 and Figure 15 As shown, both the core shaft 136 and the plastic portion 138 have a stepped structure, which reduces the production cost of the rotating shaft 130 and facilitates the assembly and mating of the rotating shaft 130 with the rotor core 110, as well as the assembly and mating of other components. The stepped positions of the core shaft 136 and the plastic portion 138 match, thereby ensuring that the wall thickness of the rotating shaft 130 is approximately the same, reducing the risk of shrinkage and deformation of the rotating shaft 130. The second positioning portion 132 is provided at the stepped position where the diameter of the plastic portion 138 is the largest, facilitating the mating of the rotating shaft 130 with the rotor core 110.

[0081] The core shaft 136 is made of plastic material. The core shaft 136 is first injection-molded into a stepped structure in one process, and then used as an insert for secondary injection molding of the rotating shaft 130. In this way, the material thickness becomes thinner each time it is injected, which reduces the injection molding time and the risk of shrinkage and deformation after demolding.

[0082] or as Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 、 Figure 13 and Figure 16As shown, plastic portion 138 has a stepped structure, which facilitates the assembly and mating of rotating shaft 130 and rotor core 110, as well as the assembly and mating of other components. Furthermore, core shaft 136 has a constant diameter cylindrical structure, which reduces the processing cost of core shaft 136 and the material input for rotating shaft 130. Second positioning portion 132 is provided at the stepped position where the diameter of plastic portion 138 is the largest, facilitating the mating of rotating shaft 130 and rotor core 110.

[0083] Mandrel 136 is made of metal and can reduce the thickness of the injected plastic material of plastic portion 138. This reduces the temperature difference on the core surface during injection molding, improving cycle time and reducing costs. It also reduces the risk of shrinkage and deformation of plastic portion 138. Furthermore, the use of metal mandrel 136 improves the overall strength and rigidity of shaft 130, enhancing product reliability. Using a metal mandrel 136 with a constant diameter allows for direct use of the original round shaft without requiring additional complex processing, which also offers cost advantages. Furthermore, the metal mandrel 136 increases the bending rigidity of shaft 130, enabling its use in applications with larger loads.

[0084] In some embodiments, optionally, as Figure 8 As shown, when both the core shaft 136 and the plastic part 138 are stepped structures, the difference between the diameter of the core shaft 136 and the diameter of the plastic part 138 ranges from 2 mm to 6 mm; or Figure 10 As shown, when the plastic portion 138 is a stepped structure and the core shaft 136 is a constant diameter columnar structure, the difference between the diameter of the core shaft 136 and the minimum diameter of the plastic portion 138 ranges from 2 mm to 6 mm.

[0085] In this embodiment, if Figure 8 As shown, when both the core shaft 136 and the plastic part 138 are stepped structures, that is, on the cross section perpendicular to the axial direction of the rotating shaft 130, at the corresponding positions of the core shaft 136 and the plastic part 138, the difference between the diameter D2 of the core shaft 136 and the diameter D1 of the plastic part 138 ranges from 2 mm to 6 mm, so that the wall thickness t of the plastic part 138 is thinner, ranging from 1 mm to 3 mm, reducing the cooling time of the plastic part 138, being beneficial to the uniformity of the plastic part 138, reducing the risk of deformation of the plastic part 138, and ensuring that the raw material can flow smoothly in the mold during injection molding.

[0086] like Figure 20As shown, the core shaft 136 is made of plastic, and the structures of the core shaft 136 and the plastic part 138 correspond to each other. The plastic part 138 is a stepped structure. The core shaft 136 is a stepped structure. The cross-sectional diameter D2 of the core part in the plastic part 138 perpendicular to the axial direction is reduced by 2mm to 6mm relative to the outer diameter D1 of the plastic part 138 with the same cross-section. The core shaft 136 is molded by the first injection and then used as an insert. The second injection of the plastic part 138 ensures that the wall thickness of the second injection is thin and relatively uniform, and the wall thickness t is thinner, ranging from 1mm to 3mm. The cooling time required by the above manufacturing method is short, the wall thickness is thin and uniform, which reduces the uneven shrinkage deformation during the secondary injection, improves the injection molding accuracy, and ensures that the raw material can flow smoothly in the mold during injection.

[0087] The difference between the diameter D2 of the core shaft 136 and the diameter D1 of the plastic portion 138 may be 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0088] or as Figure 10 As shown, when the plastic part 138 has a stepped structure and the core shaft 136 has a constant diameter cylindrical structure, on the cross section perpendicular to the axial direction of the rotating shaft 130, the difference between the diameter D4 of the core shaft 136 and the minimum diameter D3 of the plastic part 138 ranges from 2 mm to 6 mm, so that the wall thickness t of the plastic part 138 is as thin as 1 mm to 3 mm, which reduces the cooling time of the plastic part 138, is conducive to the uniformity of the plastic part 138, reduces the risk of deformation of the plastic part 138, and ensures that the raw material can flow smoothly in the mold during injection molding.

[0089] like Figure 21 As shown, the core shaft 136 is made of metal material. The core shaft 136 is used to reduce the distance between the inner surface and the outer surface of the plastic part 138, that is, to reduce the wall thickness of the plastic part 138. Reducing the wall thickness of the plastic can reduce the required cooling time. The thinnest wall thickness t is 1mm to 3mm, which reduces the shrinkage deformation of the plastic part 138 and is beneficial to the control of part precision. A metal material with a constant diameter is used as the core shaft 136. The round shaft of the raw material can be directly cut and used without additional complex processing, which also has cost advantages. At the same time, the core shaft 136 of the metal material improves the bending stiffness of the rotating shaft 130 and can be used in applications with larger loads.

[0090] The difference between the diameter D4 of the core shaft 136 and the diameter D3 of the plastic portion 138 may be 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0091] In the above description, the diameter of the plastic portion 138 may be understood as the diameter of the rotating shaft 130 .

[0092] In some embodiments, the plastic portion 138 and the core shaft 136 are optionally insert-molded.

[0093] In this embodiment, the plastic part 138 and the core shaft 136 are insert-molded, which improves the connection strength between the plastic part 138 and the core shaft 136 and reduces the risk of delamination between the plastic part 138 and the core shaft 136.

[0094] In some embodiments, optionally, the first positioning portion 114 and the second positioning portion 132 are matched by a flat fit or a keyway fit.

[0095] In this embodiment, the first positioning portion 114 and the second positioning portion 132 are matched in a flat position or a keyway manner, thereby improving the synchronous rotation effect of the rotor core 110 and the rotating shaft and ensuring the function of the motor.

[0096] Optionally, the first positioning portion 114 can be a non-circular cross-sectional feature with a certain length. The first positioning portion 114 includes but is not limited to symmetrical flat positions, uniformly distributed rectangular grooves, uniformly distributed trapezoidal grooves and spline grooves, etc., and can also be knurled, etc., designed to be symmetrical and uniformly distributed, so that the center of gravity of the rotor assembly 100 and the plastic part 138 is located on the axis of the plastic part 138, reducing the impact of dynamic imbalance caused by its own structure, which is beneficial to improving the vibration and noise performance of the motor.

[0097] In some embodiments, optionally, the plastic part 138 and the rotor core 110 are at least one of interference fit, adhesive fit, and insert molding fit.

[0098] In this embodiment, the plastic part 138 and the rotor core 110 are at least one of interference fit, adhesive fit and insert injection molding fit, thereby improving the connection strength between the rotating shaft 130 and the rotor core 110, improving the synchronous rotation effect of the rotor core 110 and the rotating shaft 130, and ensuring the function of the motor.

[0099] Specifically, the rotor core 110 and the plastic part 138 can be connected by cold pressing interference fit, gluing, or overmolding, thereby improving the connection reliability between the rotor core 110 and the rotating shaft 130 and having good manufacturability.

[0100] Optionally, the rotor core 110 and the rotating shaft 130 are connected into a whole by injection molding. This connection method has good processability and connection reliability, and the coaxiality between the outer diameter of the rotor core 110 and the rotating shaft 130 is controlled by the mold, thereby reducing the accumulation of coaxiality tolerance caused by assembly connection, having higher dimensional control accuracy, and being able to improve the vibration and noise performance of the product.

[0101] Optionally, the rotating shaft 130 is connected to the rotor core 110 by interference fit.

[0102] Optionally, the rotating shaft 130 is bonded to the rotor core 110 by glue.

[0103] Optionally, the rotating shaft 130 is connected to the rotor core 110 by using interference fit and glue bonding.

[0104] The above connection method is simple and easy to operate.

[0105] Furthermore, the rotating shaft 130 is provided with a limiting step in the axial direction, thereby limiting the relative displacement between the rotor assembly 100 and the rotating shaft 130 in the axial direction.

[0106] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 and Figure 16 As shown, in some embodiments, optionally, it also includes: a bearing 170 sleeved on the rotating shaft 130, the bearing 170 is located on at least one side of the rotor core 110, the rotating shaft 130 is a stepped shaft structure, and the step surface 134 of the bearing 170 and the rotating shaft 130 are against each other.

[0107] In this embodiment, the rotor assembly 100 also includes a bearing 170, which is sleeved on the rotating shaft 130, and the bearing 170 is located on at least one side of the rotor core 110, thereby providing support for the rotating shaft 130 and improving the rotation stability of the rotating shaft 130. In addition, the rotating shaft 130 is a stepped shaft structure, and the bearing 170 and the stepped surface 134 of the rotating shaft 130 are offset against each other, reducing the stress concentration caused by the provision of a retaining ring groove on the rotating shaft 130, thereby improving the reliability of the rotor assembly 100.

[0108] That is, the rotating shaft 130 includes a bearing 170 mounting section for mounting the bearing 170 and a rotor mounting section for mounting the rotor core 110 .

[0109] Alternatively, as Figure 4 、 Figure 6 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 14 、 Figure 15 and Figure 16 As shown, the rotating shaft 130 is a stepped structure, and the mounting section of the bearing 170 has a stepped structure formed by a small-diameter cylindrical surface and a large-diameter cylindrical surface. The small-diameter cylindrical surface cooperates with the inner ring of the bearing 170, and the step of the large-diameter cylindrical surface limits the movement of the end face of the bearing 170.

[0110] The mounting section of bearing 170 is a stepped structure consisting of a small-diameter cylindrical surface and a large-diameter cylindrical surface. The small-diameter cylindrical surface cooperates with the inner ring of bearing 170 to provide a mounting position for bearing 170. The large-diameter cylindrical surface limits the movement of the end face of bearing 170 and provides support for the axial limitation of bearing 170. Compared with the steel shaft using a retaining ring groove and a retaining ring to limit bearing 170, the risk of stress concentration and shaft fracture caused by the retaining ring groove is reduced, and the reliability of rotating shaft 130 is improved. In addition, there is no need for radial demolding in the area close to bearing 170, which reduces the difficulty of mold making and improves product manufacturability.

[0111] like Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 and Figure 17 As shown, in some embodiments, optionally, the rotor core 110 includes: a plurality of rotor blocks 120, the plurality of rotor blocks 120 surround a rotating shaft 130, and mounting grooves 116 are formed between adjacent rotor blocks 120; a shaft sleeve 118, the shaft sleeve 118 is installed in the shaft hole 112 and sleeved on the outside of the rotating shaft 130, and the first positioning portion 114 is arranged in the shaft sleeve 118.

[0112] In this embodiment, the rotor core 110 includes a sleeve 118 and a plurality of rotor blocks 120. The rotor blocks 120 are arranged on the circumferential side of the sleeve 118. The rotor blocks 120 surround an axial hole 112. The rotating shaft 130 is arranged in the axial hole 112. The first positioning portion 114 is arranged in the rotating sleeve. The rotor core 110 includes multiple parts, thereby reducing the production difficulty of the rotor core 110 and reducing the production cost of the rotor core 110.

[0113] like Figures 1 to 17 As shown, in some embodiments, optionally, the rotor assembly 100 includes: a molded portion 150 , and the molded portion 150 is fixedly connected to the rotor core 110 , the rotating shaft 130 and the magnetic component 140 by injection molding.

[0114] In this embodiment, the rotor assembly 100 also includes a plastic-coated portion 150, which is fixedly connected to the rotor core 110, the rotating shaft 130 and the magnetic component 140 by injection molding, thereby improving the connection strength of the rotating shaft 130, the rotor core 110 and the multiple magnetic components 140, and reducing the risk of separation of the rotating shaft 130, the rotor core 110 and the multiple magnetic components 140.

[0115] Specifically, the overmolded portion 150 may be an integrated structure with the plastic portion 138 of the rotating shaft 130 .

[0116] According to a second aspect of the present invention, the present invention provides a motor, comprising: a rotor assembly 100 provided in the embodiment of the first aspect.

[0117] The motor provided by the present invention includes the rotor assembly 100 provided in the first embodiment, and therefore has all the beneficial effects of the rotor assembly 100 provided in the first embodiment, which will not be listed one by one here.

[0118] According to a third aspect of the present invention, the present invention provides a wind turbine, comprising: the rotor assembly 100 provided in the embodiment of the first aspect; or the motor provided in the embodiment of the second aspect.

[0119] The motor provided by the present invention includes the rotor assembly 100 provided in the first embodiment or the motor provided in the second embodiment, and therefore has all the beneficial effects of the rotor assembly 100 provided in the first embodiment or the motor provided in the second embodiment, which are no longer listed one by one here.

[0120] According to a fourth aspect of the present invention, the present invention provides an electrical device, comprising: a rotor assembly 100 as provided in the embodiment of the first aspect; or a motor as provided in the embodiment of the second aspect; or a fan as provided in the embodiment of the third aspect.

[0121] The electrical equipment provided by the present invention includes the rotor assembly 100 provided in the first embodiment or the motor provided in the second embodiment or the fan provided in the third embodiment, and therefore has all the beneficial effects of the rotor assembly 100 provided in the first embodiment or the motor provided in the second embodiment or the fan provided in the third embodiment, which are no longer listed one by one here.

[0122] Specifically, electrical appliances include air conditioners, refrigerators, fans, ovens, and range hoods.

[0123] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0124] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or units referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0125] 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.

[0126] 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 are intended to be within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that: include: a rotor core, wherein the rotor core is provided with an axial hole and a plurality of mounting slots spaced around the axial hole, and a first positioning portion is provided in the axial hole; A rotating shaft is installed in the shaft hole, and a second positioning portion is provided on the rotating shaft, wherein the first positioning portion and the second positioning portion cooperate with each other; A plurality of magnetic members are provided in the plurality of the mounting slots; The rotating shaft is an integrated plastic shaft; or the rotating shaft includes a core shaft and a plastic portion formed on the radially outer side of the core shaft, and the core shaft is made of metal material or plastic material.

2. The rotor assembly according to claim 1, wherein: The core shaft and the plastic part both have a stepped structure, the second positioning portion is provided at the stepped position where the diameter of the plastic part is the largest, and the stepped positions of the core shaft and the plastic part match; or The plastic part has a stepped structure, the second positioning part is arranged at the stepped position where the diameter of the plastic part is the largest, and the core shaft has a columnar structure with a constant diameter.

3. The rotor assembly according to claim 2, wherein: When both the core shaft and the plastic part have a stepped structure, the difference between the diameter of the core shaft and the diameter of the plastic part ranges from 2 mm to 6 mm; or When the plastic part has a stepped structure and the core shaft has a constant diameter columnar structure, the difference between the diameter of the core shaft and the minimum diameter of the plastic part ranges from 2 mm to 6 mm.

4. The rotor assembly according to any one of claims 1 to 3, characterized in that: The plastic part and the core shaft are insert-molded.

5. The rotor assembly according to any one of claims 1 to 3, characterized in that: The cooperation between the first positioning portion and the second positioning portion is flat cooperation or keyway cooperation.

6. The rotor assembly according to any one of claims 1 to 3, characterized in that: The rotating shaft and the rotor core are at least one of interference fit, adhesive fit and insert injection molding fit.

7. The rotor assembly according to any one of claims 1 to 3, characterized in that: Also includes: A bearing is provided on the rotating shaft. The bearing is located on at least one side of the rotor core. The rotating shaft is a stepped shaft structure. The stepped surfaces of the bearing and the rotating shaft abut against each other.

8. The rotor assembly according to any one of claims 1 to 3, characterized in that: The rotor core comprises: A plurality of rotor blocks, wherein the plurality of rotor blocks surround the rotating shaft, and the mounting groove is formed between adjacent rotor blocks; A shaft sleeve is installed in the shaft hole and sleeved on the outside of the rotating shaft, and the first positioning portion is arranged in the shaft sleeve.

9. The rotor assembly according to any one of claims 1 to 3, characterized in that: The rotor assembly comprises: The overmolded portion is fixedly connected to the rotor core, the rotating shaft and the magnetic component by injection molding.

10. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 9.

11. A fan, characterized in that: include: The rotor assembly according to any one of claims 1 to 9; or The motor as claimed in claim 10.

12. An electrical device, characterized in that: include: The rotor assembly according to any one of claims 1 to 9; or The motor as claimed in claim 10; or The blower according to claim 11.

Images