A rotor assembly and electric machine
By directly machining the circumferential limiting part on the outer shell assembly, the assembly steps of the rotor assembly are simplified, the problems of complex assembly and high cost are solved, and efficient and low-cost permanent magnet connection is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGZHOU SHANGYU ELECTRIC CO LTD
- Filing Date
- 2026-05-25
- Publication Date
- 2026-07-21
AI Technical Summary
The assembly steps of rotor components in the existing technology are complex, the assembly is difficult, the processing technology requirements are high, the production cost is high, and the small-sized plug-in structure is complicated to process, requiring high precision of fixtures and tools.
The first limiting part with circumferential spacing is directly machined on the outer shell assembly, eliminating the need for a spacer structure. The limiting part is connected to the permanent magnet in the circumferential and radial directions, simplifying the assembly steps and reducing the processing difficulty and cost.
It simplifies the assembly steps of the rotor assembly, reduces production costs, improves the connection reliability of the permanent magnet, reduces the requirements for the precision of fixtures and tools, increases the machining allowance, and improves production efficiency.
Smart Images
Figure CN122437291A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric motor manufacturing, and more particularly to a rotor assembly and an electric motor. Background Technology
[0002] In the field of motor manufacturing, the rotor typically consists of a permanent magnet and a housing. The permanent magnet is usually positioned and fixed to the housing along the rotor's circumference via a specific connection structure to ensure the rotor's stability during installation and operation. These connection structures often employ multi-stage fits or complex installation methods, increasing assembly steps and processing costs. Summary of the Invention
[0003] This application provides a rotor assembly and a motor, which aims to solve the technical problem of how to simplify the assembly steps of the rotor in the related art.
[0004] A first aspect of this application provides a rotor assembly for a motor, the motor including a shaft and a stator assembly, the stator assembly being disposed through the shaft, characterized in that the rotor assembly includes:
[0005] The housing assembly is rotatably connected to the shaft. The housing assembly has a cavity for mounting the stator assembly. The housing assembly includes a plurality of first limiting parts spaced apart along the circumference of the housing assembly. An installation space is formed between two adjacent first limiting parts. The installation space includes a first sidewall and a second sidewall spaced apart along the circumference of the housing assembly. The first limiting parts on both sides of the installation space form corresponding first sidewalls and second sidewalls, respectively. Multiple permanent magnets are arranged one-to-one in multiple installation spaces and respectively abut against the first sidewall and the second sidewall. The permanent magnets are connected to the outer shell assembly.
[0006] In some embodiments, the installation space includes a third sidewall and a fourth sidewall spaced apart along the axial direction of the housing assembly; The housing assembly includes a second limiting portion disposed along the circumference of the housing assembly, the second limiting portion forming a plurality of third sidewalls, the third sidewalls abutting against corresponding permanent magnets; and / or, the housing assembly includes a third limiting portion disposed along the circumference of the housing assembly, the third limiting portion forming a fourth sidewall, the fourth sidewall abutting against corresponding permanent magnets.
[0007] In some embodiments, the second limiting portion is a continuous structure and extends circumferentially along the housing assembly; and / or, the third limiting portion is a continuous structure and extends circumferentially along the housing assembly.
[0008] In some embodiments, the plurality of first limiting portions are integrally formed with the second limiting portion; and / or, the plurality of first limiting portions are integrally formed with the third limiting portion.
[0009] In some embodiments, the housing assembly includes: The first housing includes a first connecting portion surrounding a plurality of first limiting portions, the first limiting portions being disposed on the first connecting portion and the first connecting portion being disposed outside the plurality of first limiting portions; The second housing includes a second connecting portion, which is disposed around the axial direction of the housing assembly and opposite to the first connecting portion; The third housing is connected between the first connecting part and the second connecting part. The third housing, the first housing, and the second housing together form a receiving cavity. The third housing and multiple first limiting parts together form multiple installation spaces.
[0010] In some embodiments, the installation space includes a third sidewall and a fourth sidewall spaced apart along the axial direction of the housing assembly. The third sidewall and the fourth sidewall are both connected between the first sidewall and the second sidewall. The third sidewall and the fourth sidewall abut against the permanent magnet on both sides along the axial direction of the housing assembly, respectively. The first housing includes a second limiting part, which is arranged circumferentially along the housing assembly and forms a plurality of third sidewalls. The first connecting part is connected to the second limiting part and the plurality of first limiting parts. The second housing includes a third limiting portion, which is disposed circumferentially along the housing assembly and forms a fourth sidewall. The third limiting portion is connected to the second connecting portion.
[0011] In some embodiments, the second limiting portion protrudes from the first connecting portion along the axial direction of the housing assembly; The third limiting part protrudes radially from the second connecting part along the outer casing assembly; When the third housing and the first housing are connected, the third housing abuts against the first connecting portion along the axial direction of the outer housing assembly, and the third housing abuts against the second limiting portion along the radial direction of the outer housing assembly; when the third housing and the second housing are connected, the third housing abuts against the second connecting portion along the axial direction of the outer housing assembly, and the third housing abuts against the third limiting portion along the radial direction of the outer housing assembly.
[0012] In some embodiments, the third housing is connected to the first housing and the second housing respectively by any one of the following methods: bolt connection, snap-fit connection, welding connection, riveting connection, and plug-in connection; and / or, The first limiting part and the first connecting part are connected by either welding or integral molding.
[0013] In some embodiments, the circumferential dimension of the first limiting portion of the housing assembly gradually decreases in the axial direction of the housing assembly; and / or, In the axial direction of the housing assembly, the radial dimension of the first limiting portion of the housing assembly gradually decreases to be smaller than the radial dimension of the permanent magnet in the housing assembly; and / or, The permanent magnet and the housing assembly are connected by any of the following methods: adhesive connection, welding connection, magnetic connection, or injection molding connection.
[0014] A second aspect of this application provides an electric motor, including: a shaft, a stator assembly, and a rotor assembly as described in any of the first aspects, wherein the rotor assembly is disposed through and rotatably connected to the shaft, and the stator assembly is disposed in a receiving cavity and is disposed through the shaft.
[0015] In some embodiments, the motor is an external rotor motor.
[0016] The beneficial effects of this invention are as follows: The rotor assembly of this application includes: a housing assembly for rotatably connecting to a shaft, the housing assembly having a hollow cylindrical or cup-shaped structure, and an internal cavity for mounting a stator assembly; the housing assembly includes a plurality of first limiting portions spaced circumferentially along the housing assembly, with an installation space formed between adjacent first limiting portions; the installation space includes first and second sidewalls spaced circumferentially along the housing assembly, with the first limiting portions on both sides of the installation space forming corresponding first and second sidewalls; and a plurality of permanent magnets, each permanently magnet being disposed in a corresponding manner in a plurality of installation spaces and abutting against the first and second sidewalls respectively, and the permanent magnets being connected to the housing assembly. By directly providing circumferentially spaced first limiting portions on the housing assembly, and forming installation spaces by adjacent first limiting portions, the permanent magnets are circumferentially positioned by the first and second sidewalls after being inserted into the installation space, reducing the use of independent spacers and their insertion structures, and reducing the complexity of the permanent magnet assembly steps. Furthermore, the first limiting part bears the circumferential load generated by the permanent magnet during operation, reducing the shear load on the structural adhesive layer and improving the reliability of the permanent magnet connection. After the permanent magnet and the outer shell assembly are connected, the radial connection structure and the circumferential limiting structure jointly fix the permanent magnet, preventing circumferential movement, displacement, or detachment of the permanent magnet under high-speed rotation and vibration conditions. This structure reduces the machining of small-sized plug-in structures, lowers the precision requirements of tools and fixtures, simplifies the production process, and reduces manufacturing costs. It also changes the machining object from small-volume parts such as permanent magnets and spacers to large-volume parts such as the outer shell assembly, increasing machining allowance, reducing the precision requirements of fixtures and tools, and further reducing manufacturing costs. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 This is one of the structural schematic diagrams of the rotor assembly provided in the embodiments of the present invention; Figure 2 This is a schematic cross-sectional view of the rotor assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure inside the housing assembly provided in an embodiment of the present invention; Figure 4 This is provided by the embodiments of the present invention. Figure 3 A magnified view of a portion of region A in the middle.
[0019] Explanation of icon numbers: 20. Rotor assembly; 21. Housing assembly; 211. First housing; 2111. First limiting part; 2112. Second limiting part; 2113. First connecting part; 2114. First side wall; 2115. Second side wall; 2116. Third side wall; 212. Second housing; 2121. Second connecting part; 2122. Third limiting part; 2123. Fourth side wall; 213. Third housing; 22. Receiving cavity; 23. Installation space; 24. Permanent magnet; 30. Shaft; 40. Stator assembly; 50. Axial direction of housing assembly. Detailed Implementation
[0020] Before introducing the embodiments of this application, the technical terms and background technology involved in this application will be introduced first.
[0021] In the field of electric motors, the rotor is one of the key components. Its main function is to rotate with the magnetic field generated by the stator, thereby converting electrical energy into mechanical energy or vice versa. The rotor typically consists of permanent magnets and a housing assembly. The connection structure between the permanent magnets and the housing has a significant impact on the motor's performance and reliability. The stable fixing of the permanent magnets not only ensures the uniformity of the magnetic field distribution and the stability of the torque output, but also needs to withstand the centrifugal force and vibration loads generated during high-speed rotation. Therefore, the design of the connection structure between the permanent magnets and the housing, and the method of magnet installation, directly affect the motor's efficiency, lifespan, and safety.
[0022] Taking an external rotor surface-mounted rotor as an example, the common assembly process of permanent magnets and housing is as follows: First, the inner wall of the housing and the surface of the permanent magnets are cleaned to ensure adhesive adhesion. Then, high-performance structural adhesive is evenly applied to the contact surface between each permanent magnet and the rotor housing, and the permanent magnets are bonded to the inner wall of the housing in the required positions to provide initial fixation and buffering. Next, spacers with guide grooves and other interlocking structures are inserted between adjacent permanent magnets to clamp the permanent magnets from both sides to ensure positioning accuracy and block the magnetic circuit to reduce magnetic leakage. Then, mechanical clamps are used to apply uniform pressure along the circumference to fix the permanent magnets and spacers. The structural adhesive is cured while the clamps are in place. After curing, the clamps are removed and the position and gap accuracy of the permanent magnets are checked to ensure the stability and magnetic uniformity of the rotor under high-speed rotation.
[0023] However, during assembly, the permanent magnets need to be manually positioned before being bonded together. Then, the spacers and permanent magnets need to be fitted together via an interlocking structure, making the assembly process complex. Furthermore, the spacers and permanent magnets of the outer rotor are relatively small, and the corresponding interlocking structure is also quite fragile. The fixtures and cutting tools used in the machining process need to be small in size, making them prone to failure due to wear or breakage, requiring frequent replacements. Therefore, the machining of the interlocking structure between the spacers and permanent magnets is complex, requires high-level processing techniques, has high production costs, and presents significant assembly difficulties.
[0024] In summary, the rotor components and motors in the relevant technologies have the problem of complex assembly steps, as well as high assembly difficulty, high processing technology requirements, and high production costs.
[0025] To address the aforementioned issues, this application provides a rotor assembly and a motor. By directly machining a first limiting portion onto the housing assembly instead of a spacer, the independent structure of the spacer is eliminated, thereby eliminating the need to insert the spacer during assembly. This simplifies the assembly process and reduces assembly difficulty. Furthermore, because the housing assembly is large in size, has a large machining allowance, and is easy to clamp, the requirements for machining technology are lower, resulting in lower production costs.
[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0027] Please see Figures 1 to 4 As shown, Figure 1 This is one of the structural schematic diagrams of the rotor assembly provided in the embodiments of the present invention; Figure 2 This is a schematic cross-sectional view of the rotor assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure inside the housing assembly provided in an embodiment of the present invention; Figure 4 This is provided by the embodiments of the present invention. Figure 3 A magnified view of a portion of region A in the middle.
[0028] This application provides an electric motor, including a shaft 30, a stator assembly 40, and a rotor assembly 20. The rotor assembly 20 is rotatably connected to the shaft 30, and the stator assembly 40 is disposed in a receiving cavity 22 and passes through the shaft 30. The motor is an external rotor motor, and the rotor assembly 20 includes: The housing assembly 21 is rotatably connected to the shaft 30. The housing assembly 21 has a hollow cylindrical or cup-shaped structure and an internal receiving cavity 22 for mounting the stator assembly 40. The housing assembly 21 includes a plurality of first limiting parts 2111 spaced apart along the circumference of the housing assembly 21. An installation space 23 is formed between two adjacent first limiting parts 2111. The installation space 23 includes a first sidewall 2114 and a second sidewall 2115 spaced apart along the circumference of the housing assembly 21. The first limiting parts 2111 on both sides of the installation space 23 respectively form corresponding first sidewalls 2114 and second sidewalls 2115. Multiple permanent magnets 24 are arranged one-to-one in multiple installation spaces 23 and respectively abut against the first side wall 2114 and the second side wall 2115. The permanent magnets 24 are connected to the outer shell assembly 21.
[0029] It should be noted that the circumferential direction of the housing assembly 21 refers to the direction around the shaft 30 through which the housing assembly 21 passes, which can also be understood as the direction around which the housing assembly 21 passes in the rotation direction of the rotor assembly 20. The axial direction 50 of the housing assembly refers to the length direction of the shaft 30 through which the housing assembly 21 passes, which can also be understood as the extension direction of the rotation axis of the rotor assembly 20. The radial direction of the housing assembly 21 refers to the direction perpendicular to the axial direction 50 of the housing assembly.
[0030] During actual assembly, the inner circumferential mounting surface of the housing assembly 21 and the connecting surface of the permanent magnet 24 are first cleaned. Then, structural adhesive is applied to the inner circumferential mounting surface of the housing assembly 21 or the radially outer surface of the permanent magnet 24 corresponding to the mounting space 23. The permanent magnet 24 is then inserted axially or radially into the corresponding mounting space 23, so that the two circumferential sides of the permanent magnet 24 abut against the first sidewall 2114 and the second sidewall 2115, respectively. The first limiting part 2111 serves as a positioning reference during assembly, restricting the permanent magnet 24 from shifting circumferentially along the housing assembly 21, ensuring that multiple permanent magnets 24 are distributed on the inner circumferential side of the housing assembly 21 according to a preset pole spacing. When the motor is running, the stator assembly 40 is energized to generate a rotating magnetic field. The permanent magnet 24 interacts with the rotating magnetic field and drives the housing assembly 21 to rotate around the shaft 30. The circumferential electromagnetic force and vibration load on the permanent magnet 24 are transmitted to the first sidewall 2114 and the second sidewall 2115 through the circumferential side of the permanent magnet 24, and then to the outer shell assembly 21 by the first limiting part 2111; the radial centrifugal load on the permanent magnet 24 is borne by the connecting layer between the permanent magnet 24 and the outer shell assembly 21 and the inner circumferential mounting surface of the outer shell assembly 21, so that the permanent magnet 24 maintains a stable circumferential and radial position during high-speed rotation.
[0031] By directly setting first limiting parts 2111 distributed circumferentially on the outer shell assembly 21, and forming an installation space 23 by adjacent first limiting parts 2111, the permanent magnet 24 is circumferentially positioned by the first side wall 2114 and the second side wall 2115 after being installed into the installation space 23, reducing the use of independent spacers and their plug-in structures, and reducing the complexity of the assembly steps of the permanent magnet 24.
[0032] Furthermore, the first limiting part 2111 bears the circumferential load generated by the permanent magnet 24 during operation, reducing the shear load on the structural adhesive layer and improving the connection reliability of the permanent magnet 24. After the permanent magnet 24 and the outer shell assembly 21 are connected, the radial connection structure and the circumferential limiting structure jointly fix the permanent magnet 24, preventing circumferential movement, displacement, or detachment of the permanent magnet 24 under high-speed rotation and vibration conditions. This structure reduces the machining of small-sized plug-in structures, lowers the precision requirements of tools and fixtures, simplifies the production process, and reduces manufacturing costs. It also changes the machining object from small-volume parts such as the permanent magnet 24 and spacers to large-volume parts such as the outer shell assembly 21, increasing the machining allowance, reducing the precision requirements of fixtures and tools, and further reducing manufacturing costs.
[0033] In this embodiment, the axial length of the first limiting part 2111 can be the same as the axial length of the permanent magnet 24, or shorter than the axial length of the permanent magnet 24, or segmented along the radial direction of the outer shell assembly 21; the radial protrusion height of the first limiting part 2111 is such that it can abut against the circumferential side of the permanent magnet 24 and limit its circumferential displacement. The outer shell assembly 21 can be made of a combination structure of low carbon steel, silicon steel laminated jacket, alloy steel, or aluminum alloy with a magnetic yoke; when the outer shell assembly 21 also serves as a magnetic yoke, a magnetically conductive metal material is preferred to ensure magnetic circuit closure. The first limiting part 2111 can be integrally cast, integrally stamped, or integrally machined with the outer shell assembly 21. The permanent magnet 24 can be made of magnetic steel, neodymium iron boron permanent magnet 24, ferrite permanent magnet 24, or samarium cobalt permanent magnet 24, and its surface can be provided with a nickel plating layer, epoxy coating, or phosphating protective layer. The structural adhesive can be epoxy structural adhesive, acrylic structural adhesive, or high-temperature potting compound.
[0034] In some embodiments, see Figure 3 and Figure 4 The installation space 23 includes a third sidewall 2116 and a fourth sidewall 2123 spaced apart along the axial direction of the housing assembly 21; The housing assembly 21 includes a second limiting portion 2112, which is arranged circumferentially along the housing assembly 21. The second limiting portion 2112 forms a plurality of third sidewalls 2116, which abut against the corresponding permanent magnets 24; and / or, the housing assembly 21 includes a third limiting portion 2122, which is arranged circumferentially along the housing assembly 21. The third limiting portion 2122 forms a fourth sidewall 2123, which abuts against the corresponding permanent magnets 24.
[0035] During assembly, adhesive layer curing, and high-speed rotation of the motor, the permanent magnet 24 may still experience axial movement due to axial vibration, assembly thrust, or operational impact. If the axial position of the permanent magnet 24 is restricted solely by the adhesive layer, the adhesive layer must simultaneously withstand radial centrifugal loads, circumferential shear loads, and axial impact loads, which can easily increase the risk of connection failure.
[0036] During assembly, after the permanent magnet 24 enters the corresponding installation space 23, the third sidewall 2116 and the fourth sidewall 2123 serve as positioning references to fix the position of the permanent magnet 24. During motor operation, its two circumferential sides are respectively limited by the first sidewall 2114 and the second sidewall 2115, and the axial end face of the permanent magnet 24 further abuts against the third sidewall 2116 and / or the fourth sidewall 2123. When the second limiting part 2112 is provided, after the permanent magnet 24 is installed axially to the predetermined position, one end of it abuts against the third sidewall 2116 formed by the second limiting part 2112. The third sidewall 2116 serves as an axial assembly reference, limiting the insertion depth of the permanent magnet 24. When the third limiting part 2122 is provided, the fourth sidewall 2123 formed by the third limiting part 2122 abuts and limits the permanent magnet 24 from the other end, so that the permanent magnet 24 is restricted between the third sidewall 2116 and the fourth sidewall 2123. When the motor is running, the axial vibration load or impact load on the permanent magnet 24 is transmitted through the axial end face of the permanent magnet 24 to the third side wall 2116 and / or the fourth side wall 2123, and then transmitted to the housing assembly 21 by the second limiting part 2112 and / or the third limiting part 2122, so that the axial displacement of the permanent magnet 24 is constrained by the mechanical structure. Therefore, the adhesive layer mainly undertakes the functions of bonding and fixing and local buffering, while the axial limiting load is borne by the second limiting part 2112 and / or the third limiting part 2122.
[0037] In this embodiment, the second limiting part 2112 / third limiting part 2122 can be integrally formed with the housing assembly 21, or it can be fixed to the inner circumference of the housing assembly 21 by press-fitting, welding, riveting or bonding; the second limiting part 2112 / third limiting part 2122 can adopt an integral ring structure. The axial distance between the second limiting part 2112 and the third limiting part 2122 can be determined according to the axial length of the permanent magnet 24 and the thickness of the adhesive layer. The third sidewall 2116 and the fourth sidewall 2123 can be processed into a flat surface, an arc surface or a chamfered limiting surface to reduce scratches on the coating at the end of the permanent magnet 24 during assembly. The radial height of the second limiting part 2112 and the third limiting part 2122 is based on covering the effective limiting area at the end of the permanent magnet 24 to avoid the structure being too tall and affecting the air gap between the stator assembly 40 and the rotor assembly 20.
[0038] In some embodiments, see Figure 3The second limiting portion 2112 is a continuous structure and extends circumferentially along the housing assembly 21; and / or, The third limiting part 2122 has a continuous structure and extends circumferentially along the outer casing assembly 21.
[0039] During motor operation, the continuous structure disperses the axial load transmitted by the permanent magnet 24 circumferentially to the housing assembly 21, reducing local stress concentration and improving the axial support strength of the housing assembly 21 for the permanent magnet 24. The continuous annular limiting structure also enhances the circumferential stiffness of the end or inner circumferential region of the housing assembly 21, improving the structural stability of the rotor assembly 20 during high-speed rotation.
[0040] In some embodiments, multiple first limiting portions 2111 are integrally formed with second limiting portions 2112; and / or, Multiple first limiting parts 2111 are integrally formed with third limiting parts 2122.
[0041] In this embodiment, the first limiting part 2111 and the second limiting part 2112 can be integrally formed by die casting, injection molding, powder metallurgy, stamping and stretching, turning and milling combined processing, or mold forming; the first limiting part 2111 and the third limiting part 2122 can also be integrally formed using the same process. For the metal housing assembly 21, the first limiting part 2111, the second limiting part 2112, and the third limiting part 2122 can be integrally processed using low carbon steel, alloy steel, magnetic stainless steel, or aluminum alloy materials.
[0042] In some embodiments, see Figure 2 and Figure 3 The housing assembly 21 includes: The first housing 211 includes a first connecting portion 2113 surrounding a plurality of first limiting portions 2111, the first limiting portions 2111 being disposed on the first connecting portion 2113, and the first connecting portion 2113 being disposed outside the plurality of first limiting portions 2111; The second housing 212 includes a second connecting portion 2121, which is arranged around the axis of the housing assembly 21 and opposite to the first connecting portion 2113. The third housing 213 is connected between the first connecting part 2113 and the second connecting part 2121. The third housing 213, the first housing 211 and the second housing 212 together form a receiving cavity 22. The third housing 213 and a plurality of first limiting parts 2111 together form a plurality of installation spaces 23.
[0043] In the rotor assembly 20, if the outer shell assembly 21 adopts an integral cylindrical structure, the permanent magnet 24 is easily restricted by the opening direction, the height of the limiting part and the space of the assembly tool when it is installed in the installation space 23, which makes the installation and operation of the permanent magnet 24 inconvenient, and the assembly of the stator assembly 40 will also be subject to structural restrictions.
[0044] In actual assembly, the first housing 211 can be used as a pre-assembly base. Multiple first limiting portions 2111 are pre-set on the first connecting portion 2113 and arranged at intervals along the circumference of the outer shell assembly 21. Then, multiple permanent magnets 24 are placed between adjacent first limiting portions 2111, so that the circumferential sides of the permanent magnets 24 are restricted by the first limiting portions 2111. Next, the third housing 213 is connected to the first housing 211. After the third housing 213 is connected to the first connecting portion 2113, the third housing 213 is located radially outside or radially supporting to the multiple permanent magnets 24, and together with the first connecting portion 2113, defines the installation position of the permanent magnets 24. At this point, the permanent magnets 24 can be initially defined between the third housing 213 and the two adjacent first limiting portions 2111. Next, the second housing 212 is connected to the third housing 213, so that the second connecting part 2121 is positioned opposite to the first connecting part 2113, and the second connecting part 2121 participates in forming the mounting space 23. After the second housing 212 is connected in place, the third housing 213 and the multiple first limiting parts 2111 together enclose multiple mounting spaces 23, and the multiple permanent magnets 24 are respectively held in the corresponding mounting space 23. When the motor is running, the circumferential load on the permanent magnet 24 is distributed to the entire housing assembly 21 through the first limiting parts 2111, so that the housing assembly 21 as a whole rotates around the shaft 30 under the action of the permanent magnet 24 and the electromagnetic field.
[0045] In some embodiments, see Figure 3 and Figure 4 The installation space 23 includes a third sidewall 2116 and a fourth sidewall 2123 spaced apart along the axial direction of the housing assembly 21. The third sidewall 2116 and the fourth sidewall 2123 are both connected between the first sidewall 2114 and the second sidewall 2115. The third sidewall 2116 and the fourth sidewall 2123 abut against the permanent magnet 24 on both sides along the axial direction 50 of the housing assembly. The first housing 211 includes a second limiting part 2112, which is arranged circumferentially along the housing assembly 21 and forms a plurality of third sidewalls 2116. The first connecting part 2113 is connected to the plurality of first limiting parts 2111 through the second limiting part 2112. The second housing 212 includes a third limiting portion 2122, which is disposed circumferentially along the housing assembly 21 and forms a fourth sidewall 2123. The third limiting portion 2122 is connected to the second connecting portion 2121.
[0046] In practical applications, during assembly, the first housing 211 can be used as a pre-installation base for the permanent magnet 24. Since the first housing 211 has multiple first limiting parts 2111 and second limiting parts 2112, adjacent first limiting parts 2111 form the circumferential mounting boundary of the permanent magnet 24, and the second limiting parts 2112 form the axial mounting reference for one end of the permanent magnet 24. Therefore, when the permanent magnet 24 is installed into the first housing 211, its two circumferential sides abut against the first sidewall 2114 and the second sidewall 2115 respectively, and its axial end face abuts against the third sidewall 2116 formed by the second limiting parts 2112. At this time, the permanent magnet 24 can achieve circumferential positioning and one-end axial positioning on the first housing 211.
[0047] After the permanent magnet 24 is pre-assembled, the second housing 212 is aligned with the first housing 211 along the axial direction of the outer shell assembly 21, so that the second connecting portion 2121 of the second housing 212 is engaged with the first connecting portion 2113 of the first housing 211, and the third limiting portion 2122 of the second housing 212 is brought close to the other axial end face of the permanent magnet 24. After the first housing 211 and the second housing 212 are connected in place, the fourth sidewall 2123 formed by the third limiting portion 2122 abuts against the other axial end face of the permanent magnet 24, thereby confining the permanent magnet 24 between the third sidewall 2116 and the fourth sidewall 2123. The first housing 211 and the second housing 212 can be fixed by welding, press-fitting, riveting, snap-fitting, threaded connection, bonding or interference fit. After fixing, the first housing 211 and the second housing 212 together enclose the receiving cavity 22 and multiple installation spaces 23, and the permanent magnet 24 is stably set in the corresponding installation space 23.
[0048] The mounting space 23 further includes a third sidewall 2116 and a fourth sidewall 2123 spaced 50° along the axial direction of the housing assembly. The third sidewall 2116 and the fourth sidewall 2123 are both connected between the first sidewall 2114 and the second sidewall 2115, forming limiting boundaries for the mounting space 23 at least on both circumferential and axial sides. The first sidewall 2114 and the second sidewall 2115 abut against the two circumferential sides of the permanent magnet 24, respectively, while the third sidewall 2116 and the fourth sidewall 2123 abut against the two end faces of the permanent magnet 24 along the axial direction of the housing assembly 21, respectively.
[0049] In some embodiments, see Figure 3 and Figure 4 The second limiting part 2112 protrudes from the first connecting part 2113 along the axial direction 50 of the outer shell assembly; The third limiting part 2122 protrudes radially from the second connecting part 2121 along the outer shell assembly 21; When the third housing 213 and the first housing 211 are connected, the third housing 213 abuts against the first connecting portion 2113 along the axial direction 50 of the outer shell assembly, and abuts against the second limiting portion 2112 along the radial direction of the outer shell assembly 21; when the third housing 213 and the second housing 212 are connected, the third housing 213 abuts against the second connecting portion 2121 along the axial direction 50 of the outer shell assembly, and abuts against the third limiting portion 2122 along the radial direction of the outer shell assembly 21.
[0050] During assembly, by making the second limiting part 2112 protrude from the first connecting part 2113 along the axial direction 50 of the outer shell assembly, the second limiting part 2112 can form a radial abutment structure with the third shell 213, thereby radially positioning the third shell 213 when it is connected to the first shell 211. This structure helps improve the coaxiality between the third shell 213 and the first shell 211, reducing the risk of the third shell 213 becoming eccentric relative to the first shell 211. By making the third shell 213 abut against the first connecting part 2113 along the axial direction 50 of the outer shell assembly, the first connecting part 2113 can define the axial assembly position of the third shell 213 relative to the first shell 211. This improves the axial positioning accuracy of one end of the third shell 213, preventing the third shell 213 from being assembled too deeply or not properly. By having the third limiting portion 2122 protrude radially from the second connecting portion 2121 along the outer shell assembly 21, the third shell 213 is radially positioned when connected to the second shell 212. This structure helps improve the coaxiality between the third shell 213 and the second shell 212. By having the third shell 213 abut against the second connecting portion 2121 along the axial direction 50 of the outer shell assembly, the second connecting portion 2121 can define the axial assembly position of the third shell 213 relative to the second shell 212. Thus, the third shell 213 has a clear axial positioning reference at both ends, making the overall axial dimension of the outer shell assembly 21 more stable.
[0051] In some embodiments, the third housing 213 is connected to the first housing 211 and the second housing 212 by any one of the following methods: bolted connection, snap-fit connection, welded connection, riveted connection, or plug-in connection; and / or, The first limiting part 2111 and the first connecting part 2113 are connected by either welding or integral molding.
[0052] In some embodiments, reference is made to Figure 4 In the axial direction 50 of the housing assembly, the circumferential dimension of the first limiting portion 2111 in the housing assembly 21 gradually decreases; and / or, in the axial direction 50 of the housing assembly, the radial dimension of the first limiting portion 2111 in the housing assembly 21 gradually decreases to less than the radial dimension of the permanent magnet 24 in the housing assembly 21.
[0053] By gradually reducing the circumferential dimension of the first limiting portion 2111 in the axial direction of the housing assembly 21, and / or gradually reducing the radial dimension of the first limiting portion 2111 in the axial direction of the housing assembly 21 to less than the radial dimension of the permanent magnet 24 in the housing assembly 21, an axially extending clearance space or adhesive-containing space can be formed between the first limiting portion 2111 and the permanent magnet 24. When the permanent magnet 24 is bonded to the housing assembly 21, during the process of pressing the permanent magnet 24 into the mounting space 23, excess adhesive can be squeezed into the clearance space or adhesive-containing space, thereby reducing the accumulation of excess adhesive on the positioning surface of the permanent magnet 24, the first sidewall 2114, the second sidewall 2115, or the air gap side. Therefore, on the one hand, it can avoid the permanent magnet 24 not being able to be assembled properly due to excessive adhesive, thus improving the assembly accuracy of the permanent magnet 24; on the other hand, it can prevent excess adhesive from overflowing into the air gap area between the stator assembly 40 and the permanent magnet 24, reducing the risk of interference, abnormal noise, or friction when the rotor assembly 20 rotates. At the same time, the adhesive contained in the clearance space can also increase the bonding area between the permanent magnet 24 and the housing assembly 21 after curing, improving the fixing reliability and vibration resistance of the permanent magnet 24.
[0054] In some embodiments, the permanent magnet 24 and the housing assembly 21 are connected by any of the following methods: adhesive connection, welding connection, magnetic connection, and injection molding connection.
[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0056] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.
[0057] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.
[0058] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A rotor assembly for an electric motor, the electric motor including a shaft and a stator assembly, the stator assembly passing through the shaft, characterized in that, The rotor assembly includes: A housing assembly for rotatably connecting to a shaft, the housing assembly having an internal cavity for mounting the stator assembly, the housing assembly including a plurality of first limiting portions spaced apart circumferentially along the housing assembly, an installation space being formed between two adjacent first limiting portions, the installation space including a first sidewall and a second sidewall spaced apart circumferentially along the housing assembly, the first limiting portions on both sides of the installation space forming corresponding first sidewalls and second sidewalls respectively; Multiple permanent magnets are disposed in a corresponding manner in multiple installation spaces and respectively abut against the first sidewall and the second sidewall. The permanent magnets are connected to the outer shell assembly.
2. The rotor assembly according to claim 1, characterized in that, The installation space includes a third sidewall and a fourth sidewall spaced apart along the axial direction of the housing assembly; The housing assembly includes a second limiting portion disposed along the circumference of the housing assembly, the second limiting portion forming a plurality of the third sidewalls, the third sidewalls abutting against the corresponding permanent magnets; and / or, the housing assembly includes a third limiting portion disposed along the circumference of the housing assembly, the third limiting portion forming a fourth sidewall, the fourth sidewall abutting against the corresponding permanent magnets.
3. The rotor assembly according to claim 2, characterized in that, The second limiting portion is a continuous structure and extends circumferentially along the housing assembly; and / or, The third limiting portion is a continuous structure and extends circumferentially along the housing assembly.
4. The rotor assembly according to claim 2, characterized in that, Multiple first limiting portions are integrally formed with second limiting portions; and / or, The first limiting part and the third limiting part are integrally formed.
5. The rotor assembly according to claim 1, characterized in that, The housing assembly includes: A first housing includes a first connecting portion surrounding a plurality of first limiting portions, the first limiting portions being disposed on the first connecting portion and the first connecting portion being disposed outside the plurality of first limiting portions; The second housing includes a second connecting portion, which is disposed around the axial direction of the housing assembly and opposite to the first connecting portion; The third housing is connected between the first connecting portion and the second connecting portion. The third housing, the first housing, and the second housing together enclose the receiving cavity. The third housing and the plurality of first limiting portions together enclose the plurality of installation spaces.
6. The rotor assembly according to claim 5, characterized in that, The installation space includes a third sidewall and a fourth sidewall spaced apart along the axial direction of the housing assembly. The third sidewall and the fourth sidewall are both connected between the first sidewall and the second sidewall. The third sidewall and the fourth sidewall respectively abut against the permanent magnet on both sides along the axial direction of the housing assembly. The first housing includes a second limiting portion, which is arranged circumferentially along the housing assembly and forms a plurality of the third sidewalls. The first connecting portion is connected to the second limiting portion and the plurality of first limiting portions. The second housing includes a third limiting portion, which is disposed circumferentially along the outer shell assembly and forms the fourth sidewall. The third limiting portion is connected to the second connecting portion.
7. The rotor assembly according to claim 6, characterized in that, The second limiting portion protrudes from the first connecting portion along the axial direction of the housing assembly; The third limiting portion protrudes radially from the second connecting portion of the housing assembly; Specifically, when the third housing is connected to the first housing, the third housing abuts against the first connecting portion along the axial direction of the outer shell assembly, and the third housing abuts against the second limiting portion along the radial direction of the outer shell assembly; when the third housing is connected to the second housing, the third housing abuts against the second connecting portion along the axial direction of the outer shell assembly, and the third housing abuts against the third limiting portion along the radial direction of the outer shell assembly.
8. The rotor assembly according to any one of claims 5-7, characterized in that, The third housing is connected to the first housing and the second housing respectively by any one of the following methods: bolt connection, snap-fit connection, welding connection, riveting connection, or plug-in connection; and / or, The first limiting part and the first connecting part are connected by either welding or integral molding.
9. The rotor assembly according to any one of claims 1-7, characterized in that, In the axial direction of the housing assembly, the dimension of the first limiting portion in the circumferential direction of the housing assembly gradually decreases; and / or, In the axial direction of the housing assembly, the radial dimension of the first limiting portion in the housing assembly gradually decreases to be smaller than the radial dimension of the permanent magnet in the housing assembly; and / or, The permanent magnet and the outer shell assembly are connected by any one of the following methods: adhesive connection, welding connection, magnetic connection, or injection molding connection.
10. An electric motor, characterized in that, include: The shaft, stator assembly, and rotor assembly as described in any one of claims 1-9, wherein the rotor assembly passes through and is rotatably connected to the shaft, and the stator assembly is disposed in the receiving cavity and passes through the shaft.