Rotor assembly, motor assembly, and electronic device

Abstract

The present application provides a rotor assembly, a motor assembly, and an electronic device. The rotor assembly comprises a rotor yoke, magnets, and an isolation ring. The magnets are arranged on a first side surface of the rotor yoke, and the first side surface is configured to face a stator assembly. The isolation ring is arranged on the first side surface, is located at least at the end portions of the magnets in the axial direction of the rotor yoke, and protrudes from the magnets in a direction facing away from the first side surface. The rotor assembly provided by the present application can enhance the reliability of the rotor assembly and the motor assembly.

Description

Rotor assembly, motor assembly and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202510484167.8, filed on April 16, 2025, entitled “Rotor Assembly, Motor Assembly and Electronic Equipment”, which is incorporated herein by reference in its entirety.

[0002] [Technical Field]

[0003] This application relates to the field of motor technology, and in particular to a rotor assembly, motor assembly and electronic equipment.

[0004] [Background Technology]

[0005] Existing hollow-structure motor assemblies involve machining the rotor yoke of the rotor assembly to enable the yoke to index and position the magnets. However, machining the rotor yoke results in poor yoke stiffness, leading to poor reliability of both the rotor assembly and the motor assembly.

[0006] [Summary of the Invention]

[0007] This application provides a rotor assembly, a motor assembly, and an electronic device to solve the technical problem of poor reliability in existing rotor assemblies and motor assemblies.

[0008] To solve the above-mentioned technical problems, this application provides a rotor assembly, which includes a rotor yoke, a magnet and an isolation ring. The magnet is disposed on a first side of the rotor yoke, and the first side is configured to face the stator assembly. The isolation ring is disposed on the first side and is located at least at the end of the magnet in the axial direction of the rotor yoke. The isolation ring protrudes from the magnet in a direction away from the first side.

[0009] In one embodiment, the rotor assembly includes a plurality of magnets circumferentially spaced along the rotor yoke; the isolation ring includes a first isolation block disposed on a first side surface, at least a portion of the first isolation block being located at the axial ends of the magnets on the rotor yoke and at least a portion being located between two adjacent magnets.

[0010] In one embodiment, the first isolation block includes a vertically arranged first isolation portion and a limiting portion. The first isolation portion is located between two adjacent magnets, and the limiting portion is located at the end of the magnet in the axial direction of the rotor yoke. The limiting portion protrudes from the magnet in a direction away from the first side.

[0011] In one embodiment, the limiting portion includes a first limiting portion and a second limiting portion arranged circumferentially, and the first limiting portion and the second limiting portion are located on opposite sides of the first isolation portion. The first limiting portion abuts against one end of two adjacent magnets in the axial direction of the rotor yoke, and the second limiting portion abuts against the other end of two adjacent magnets in the axial direction of the rotor yoke. The isolation ring is formed by piecing together a plurality of first isolation blocks.

[0012] In one embodiment, a first side surface is provided with a plurality of first mounting slots spaced circumferentially along the rotor yoke; the rotor assembly includes a plurality of magnets, which are respectively installed in the plurality of first mounting slots.

[0013] In one embodiment, the rotor assembly further includes a limiting ring disposed on a first side and located at the other end of the magnet in the axial direction of the rotor yoke.

[0014] In one embodiment, the limiting ring includes a limiting strip disposed circumferentially on a first side surface along the rotor yoke. A plurality of second isolation portions are formed at a circumferential interval at one end of the limiting strip near the magnet, so as to form a plurality of second mounting grooves at a circumferential interval on the first side surface. The rotor assembly includes a plurality of magnets, and the magnets are at least partially located in the second mounting grooves.

[0015] In one embodiment, the magnet and the isolation ring are respectively attached to the first side surface.

[0016] To solve the above-mentioned technical problems, this application provides a motor assembly, which includes a rotor assembly and a stator assembly, wherein the stator assembly and the rotor assembly are magnetically coupled.

[0017] In one embodiment, the motor assembly further includes a bearing, and a stator assembly is sleeved on the outside of the rotor assembly; the stator assembly is connected to the outer ring of the bearing, and the rotor assembly is connected to the inner ring of the bearing; the outer ring protrudes from the inner ring toward the stator assembly, and a third mounting groove is provided on the end face of the outer ring toward the stator assembly, the stator assembly is at least partially disposed in the third mounting groove, and is spaced apart from the inner ring; a fourth mounting groove is provided on the side of the inner ring toward the rotor assembly, and the rotor assembly is fitted with the stop of the fourth mounting groove.

[0018] In one embodiment, the isolation ring is located on the side of the magnet away from the bearing.

[0019] To address the aforementioned technical problems, this application provides an electronic device that includes the aforementioned motor assembly.

[0020] The beneficial effects of this application are as follows: The rotor assembly of this application includes a rotor yoke, a magnet, and an isolation ring. The magnet is disposed on a first side of the rotor yoke facing the stator assembly to achieve magnetic coupling between the rotor assembly and the stator assembly. The isolation ring is disposed on the first side and is located at least at the axial end of the magnet on the rotor yoke. Therefore, the isolation ring can restrict the movement of the magnet relative to the rotor yoke in the axial direction. Furthermore, the isolation ring protrudes from the magnet in a direction away from the first side, thus reducing magnetic leakage of the magnet in the axial direction of the rotor yoke. In addition, the rotor yoke of this application does not require additional positioning, indexing, or other structural processing, making its processing simple and improving the machining accuracy and reliability of the rotor yoke, thereby enhancing the reliability of the rotor assembly. Therefore, the rotor assembly of this application can enhance the reliability of both the rotor assembly and the motor assembly.

[0021] [Attached Image Description]

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0023] Figure 1 is a schematic diagram of a rotor assembly according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of an embodiment of the magnet assembly provided in this application;

[0025] Figure 3 is a structural schematic diagram of another embodiment of the magnet assembly provided in this application;

[0026] Figure 4 is a structural schematic diagram of an embodiment of the isolation ring provided in this application;

[0027] Figure 5 is a structural schematic diagram of another embodiment of the isolation ring provided in this application;

[0028] Figure 6 is a structural schematic diagram of an embodiment of the motor assembly provided in this application;

[0029] Figure 7 is a cross-sectional schematic diagram of one embodiment of the motor assembly of the embodiment in Figure 6.

[0030] Reference numerals: 10-Motor assembly; 100-Stator assembly; 200-Rotor assembly; 210-Rotor yoke; 220-Magnet; 230-Isolation ring; 231-First isolation block; 2311-First isolation section; 2312-Limiting section; 2312a-First limiting section; 2312b-Second limiting section; 241-Limiting strip; 2411-Second isolation section; 2412-Second mounting groove; 300-Bearing; 310-Outer ring; 320-Inner ring.

[0031]

Detailed Implementation Methods

[0032] The technical solutions of the embodiments of this application 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 this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] This application provides a rotor assembly. Referring to Figures 1 to 5, Figure 1 is a structural schematic diagram of one embodiment of the rotor assembly provided in this application; Figure 2 is a structural schematic diagram of one embodiment of the magnet assembly provided in this application; Figure 3 is a structural schematic diagram of another embodiment of the magnet assembly provided in this application; Figure 4 is a structural schematic diagram of one embodiment of the isolation ring provided in this application; and Figure 5 is a structural schematic diagram of another embodiment of the isolation ring provided in this application. The rotor assembly 200 includes a rotor yoke 210, a magnet 220, and an isolation ring 230.

[0036] The rotor yoke 210, also known as the rotor core, primarily functions to transmit magnetic flux and support and fix the magnet 220. Additionally, it acts as a motor shaft to transmit torque. Specifically, the rotor yoke 210 is annular. The first side of the rotor yoke 210 is positioned facing the stator assembly 100. For example, the first side can be the inner side of the rotor yoke 210, or it can be the outer side opposite to the inner side; there are no limitations. The rotor yoke 210 is made of a highly permeable ferromagnetic material, such as silicon steel sheets or low-carbon steel; there are no limitations. The magnet 220 is disposed on the first side to magnetically couple the rotor assembly 200 and the stator assembly 100.

[0037] An isolation ring 230 is disposed on the first side surface and is located at least at the end of the magnet 220 along the axial X direction of the rotor yoke 210. The isolation ring 230 protrudes from the magnet 220 in a direction away from the first side surface. Understandably, the end of the magnet 220 along the axial X direction of the rotor yoke 210 is at least partially blocked by the isolation ring 230, thus restricting the movement of the magnet 220 relative to the rotor yoke 210 along the axial X direction. Furthermore, the end blocked by the isolation ring 230 is completely blocked in the radial Y direction of the rotor yoke 210 by the isolation ring 230, thus reducing magnetic leakage of the magnet 220 along the axial X direction of the rotor yoke 210. The isolation ring 230 can be located at any end of the magnet 220 along the axial X direction of the rotor yoke 210, and is not limited here. The isolation ring 230 can be formed by machining the rotor yoke 210, or it can be a separate component, and is not limited here. The isolation ring 230 can be a single structure, or it can be a structure composed of multiple substructures; there are no restrictions on this.

[0038] The rotor assembly 200 of this application includes a rotor yoke 210, a magnet 220, and an isolation ring 230. The magnet 220 is disposed on a first side of the rotor yoke 210 facing the stator assembly 100 to achieve magnetic coupling between the rotor assembly 200 and the stator assembly. The isolation ring 230 is disposed on the first side and is located at least at the end of the magnet 220 in the axial direction X of the rotor yoke 210. Therefore, the isolation ring 230 can restrict the movement of the magnet 220 relative to the rotor yoke 210 in the axial direction X of the rotor yoke 210. In addition, the isolation ring 230 protrudes from the magnet 220 in a direction away from the first side. Therefore, the isolation ring 230 can reduce the leakage flux of the magnet 220 in the axial direction X of the rotor yoke 210, thereby enhancing the reliability of the rotor assembly 200 and thus enhancing the reliability of the motor assembly. Furthermore, the rotor yoke 210 of this application does not require the fabrication of a structure for indexing and positioning of the magnet 220. Its fabrication is simple, which can improve the fabrication accuracy of the rotor yoke 210 and enhance its reliability. In addition, it can reduce the fabrication cost of the rotor yoke 210.

[0039] In one embodiment, the rotor assembly 200 includes a plurality of magnets 220 spaced circumferentially along the rotor yoke 210. Specifically, the magnets 220 of different polarities are arranged alternately; for example, the plurality of magnets 220 are arranged sequentially as N-pole, S-pole, N-pole, and S-pole along the circumferential Z direction of the rotor yoke 210. The isolation ring 230 includes a first isolation block 231 disposed on a first side surface. At least a portion of the first isolation block 231 is located at the end of the magnet 220 in the axial X direction of the rotor yoke 210 to limit the magnet 220 in the axial X direction of the rotor yoke 210. At least a portion of the first isolation block 231 is also located between two adjacent magnets 220 to separate the two adjacent magnets 220. In this embodiment, the isolation ring 230, by setting the first isolation block 231, can achieve the isolation of two adjacent magnets 220, and at the same time achieve the limiting of the magnets 220 in the axial direction X of the rotor yoke 210. That is, the isolation ring 230 in this embodiment can achieve the positioning, indexing and isolation functions of the magnets 220, which enhances the practicality of the isolation ring 230, reduces the use of additional indexing components, and can reduce the cost of the rotor assembly 200.

[0040] In one embodiment, referring to FIG4, the first isolation block 231 includes a vertically disposed first isolation 2311 and a limiting portion 2312. The first isolation portion 2311 is located between two adjacent magnets 220 to achieve indexing of the two adjacent magnets 220. The limiting portion 2312 is located at the end of the magnet 220 on the axial X-axis of the rotor yoke 210 to achieve limiting of the magnet 220 on the axial X-axis of the rotor yoke 210. Specifically, the limiting portion 2312 and the first isolation portion 2311 can be arranged in an "L" shape, wherein the "|" in the "L" shape represents the first isolation portion 2311 and the "—" in the "L" shape represents the limiting portion 2312; or the limiting portion 2312 and the first isolation portion 2311 can be arranged in a "T" shape, wherein the "|" in the "T" shape represents the first isolation portion 2311 and the "—" in the "T" shape represents the limiting portion 2312.

[0041] The first isolation block 231 in this embodiment includes a vertically arranged first isolation part 2311 and a limiting part 2312. Its structure is simple and easy to process, which can reduce the processing cost of the first isolation block 231, thereby reducing the cost of the rotor assembly 200.

[0042] In one embodiment, the limiting part 2312 protrudes from the magnet 220 in a direction away from the first side, that is, along the radial Y of the rotor yoke 210. The limiting part 2312 can completely block the end of the magnet 220 in the radial Y of the rotor yoke 210, thereby reducing the leakage flux of the magnet 220 and enhancing the reliability of the motor assembly. The limiting part 2312 can also enhance the limiting effect on the magnet 220 in the axial X of the rotor yoke 210.

[0043] In one embodiment, the limiting part 2312 abuts against the end of the magnet 220 in the axial X direction of the rotor yoke 210, which can reduce the gap between the limiting part 2312 and the rotor yoke 210, further reduce the magnetic leakage of the magnet 220, and further enhance the limiting effect of the limiting part 2312 on the magnet 220 in the axial X direction of the rotor yoke 210.

[0044] In one embodiment, the first isolation portion 2311 and the limiting portion 2312 are integrally formed to reduce the installation process of the rotor assembly 200 and reduce the assembly difficulty of the rotor assembly 200.

[0045] In one embodiment, the isolation ring 230 is formed by assembling a plurality of first isolation blocks 231. The limiting portion 2312 of the first isolation block 231 includes a first limiting portion 2312a and a second limiting portion 2312b arranged circumferentially in the Z direction, and the first limiting portion 2312a and the second limiting portion 2312b are located on opposite sides of the first isolation portion 2311. The first limiting portion 2312a, the second limiting portion 2312b, and the first isolation portion 2311 are arranged in a "T" shape. The first limiting portion 2312a abuts against one end of two adjacent magnets 220 in the axial X direction of the rotor yoke 210, and the second limiting portion 2312b abuts against the other end of two adjacent magnets 220 in the axial X direction of the rotor yoke 210. That is, one first isolation block 231 can separate two adjacent magnets 220, and can also limit the two adjacent magnets 220 in the axial X direction of the rotor yoke 210 and reduce magnetic leakage. In addition, the isolation ring 230 is formed by piecing together multiple first isolation blocks 231, which can reduce the assembly difficulty of the isolation ring 230.

[0046] In one embodiment, the first isolation block 231 may be made of non-metallic materials such as plastic, nylon, epoxy glass cloth, etc., and there is no limitation herein.

[0047] In one embodiment, the number of first isolation blocks 231 corresponds one-to-one with the number of magnets 220.

[0048] In one embodiment, the first side of the rotor yoke 210 is provided with a plurality of first mounting slots (not shown in the figure) spaced apart along the circumferential Z direction of the rotor yoke 210. A plurality of magnets 220 are respectively mounted in the plurality of first mounting slots. The first mounting slots can be recesses (not shown in the figure) and protrusions (not shown in the figure) machined on the surface of the first side of the rotor yoke 210, and the magnets 220 can be disposed within the recesses. Alternatively, the first mounting slot can be the space formed by the first isolation portions 2311 of two adjacent first isolation blocks 231 along the circumferential Z direction of the rotor yoke 210; this is not limited in this respect.

[0049] In this embodiment, the rotor yoke 210 has a plurality of spaced first mounting slots on its first surface for mounting a plurality of magnets 220. The first mounting slots can index and position the magnets 220.

[0050] In one embodiment, the rotor assembly 200 further includes a limiting ring (not shown in the figure), which is disposed on the first side and located at the other end of the magnet 220 in the axial direction X of the rotor yoke 210. The specific structure of the limiting ring can be the same as that of any embodiment of the isolation ring 230 described above, or the limiting ring can be an annular collar, etc., and is not limited herein.

[0051] Understandably, in this embodiment, in the rotor assembly 200, along the axial direction X of the rotor yoke 210, the magnet 220 is located between the isolation ring 230 and the limiting ring. When the magnet 220 moves relative to the rotor yoke 210 along the axial direction X, it is limited by the limiting ring or the isolation ring 230 in the direction of movement. Even if the fixing effect between the magnet 220 and the first surface of the rotor yoke 210 fails, there will be no axial movement in X. In addition, the limiting ring or the isolation ring 230 can also prevent the magnet 220 from being exposed, thereby preventing foreign objects, especially ferromagnetic materials, from being attracted into the interior of the rotor assembly 200, thus playing the role of preventing foreign objects and reducing magnetic leakage.

[0052] In one embodiment, the limiting ring includes a limiting strip 241. The limiting strip 241 is disposed on a first side surface along the circumferential direction Z of the rotor yoke 210. At the end of the limiting strip 241 near the magnet 220, a plurality of second isolation portions 2411 are formed, spaced apart along the circumferential direction Z of the rotor yoke 210. The interval between two adjacent second isolation portions 2411 forms a second mounting groove 2412, and the plurality of second mounting grooves 2412 are spaced apart along the circumferential direction Z of the rotor yoke 210. The magnet 220 is at least partially located within the second mounting groove 2412, i.e., along the axial direction X of the rotor yoke 210. The size of the second isolation portion 2411 is less than or equal to the size of the magnet 220 along the axial direction X of the rotor yoke 210.

[0053] The limiting ring in this embodiment includes a limiting strip 241. At one end of the limiting strip 241 near the magnet 220, a plurality of second isolation portions 2411 are formed at Z-intervals along the circumference of the rotor yoke 210. The interval between two adjacent second isolation portions 2411 forms a second mounting groove 2412 for mounting the magnet 220. That is, the rotor assembly 200 in this embodiment can also index the magnet 220 through the limiting strip 241, without the need to additionally process mounting grooves for indexing and positioning the magnet 220 on the first side of the rotor yoke 210, which can enhance the strength of the rotor yoke 210 and thus enhance the reliability of the motor assembly.

[0054] In one embodiment, the limiting ring may be formed by splicing multiple limiting strips 241 into a complete circle, or by splicing a linear limiting strip 241 into a complete circle, or the limiting ring may be formed by a ring-shaped limiting strip 241 sleeved on top of each other, and there are no restrictions on this.

[0055] In one embodiment, the limiting ring is formed by splicing a linear limiting strip 241 into a complete circle, wherein the length of the splicing strip is greater than or equal to the outer perimeter of the first plane of the rotor yoke 210.

[0056] In one embodiment, the limiting ring can be formed by splicing multiple limiting strips 241 into a complete circle. The limiting ring is formed by splicing different numbers of limiting strips 241 according to the radial size of the rotor yoke. The limiting ring is formed by splicing multiple limiting strips 241 into a circle, which can be compatible with rotor yokes 210 with different radial sizes and can reduce the development cycle of the limiting ring.

[0057] In one embodiment, the limiting strip 241 can be molded or 3D printed from non-metallic materials such as plastic or nylon, and there are no restrictions on this.

[0058] In one embodiment, the magnet 220 and the isolation ring 230 are respectively attached to the first side of the rotor yoke 210. The arrangement of the magnet 220 and the isolation ring 230 is simple and can reduce the assembly difficulty of the rotor assembly 200.

[0059] In one embodiment, the limiting ring includes a collar (not shown in the figure), which is sleeved on the first side and located at the other end of the magnet 220 relative to the isolation ring 230 along the axial direction X of the rotor yoke 210. The collar abuts against the end of the magnet 220 along the axial direction X of the rotor yoke 210, thus restricting the movement of the magnet 220 relative to the rotor yoke 210 along the axial direction X of the rotor towards the side where the collar is located. Furthermore, the abutment between the collar and the end of the magnet 220 also reduces magnetic leakage of the magnet 220.

[0060] In one embodiment, the collar can be a plastic collar, a nylon collar, or other collar with magnetic isolation function, and is not limited thereto.

[0061] In one embodiment, the magnet 220 is made of permanent magnet materials such as neodymium iron boron, samarium cobalt, and ferrite, or the magnet 220 may be electrically excited, which is not limited here.

[0062] In one embodiment, the assembly process of the rotor assembly 200 of this application is as follows: First, the limiting strip 241 is attached and fixed to the outer surface of the rotor yoke 210. Then, the magnet 220 is inserted into the second mounting groove 2412 of the limiting strip 241 and pushed to the bottom limit. After the two magnets 220 are attached to the limiting strip 241, a first isolation block 231 can be inserted and attached to the rotor yoke 210 and the magnets 220 for fixation. The first isolation part 2311 can be inserted between the two magnets 220 to serve as a separator and positioning element.

[0063] In one embodiment, after the magnet 220 and the first isolation block 231 are assembled, the limiting strip 241 can be removed so that the limiting strip 241 can be reused.

[0064] This application provides a motor assembly. Referring to Figures 6 and 7, Figure 6 is a structural schematic diagram of an embodiment of the motor assembly provided in this application; Figure 7 is a cross-sectional schematic diagram of an embodiment of the motor assembly of Figure 6. The motor assembly 10 includes a rotor assembly 200 and a stator assembly 100, and the stator assembly 100 and the rotor assembly 200 are magnetically coupled. The rotor assembly 200 can be any one of the rotor assembly 200 embodiments described above, and is not limited herein.

[0065] In one embodiment, the motor assembly 10 further includes a bearing 300, which includes an outer ring 310 and an inner ring 320, wherein the outer ring 310 is located outside the inner ring 320, and the outer ring 310 and inner ring 320 are coaxially arranged. The stator assembly 100 and the rotor assembly 200 are connected via the bearing 300. For example, the rotor assembly 200 is sleeved outside the stator assembly 100, the stator assembly 100 is connected to the inner ring 320 of the bearing 300 along the axial direction X, and the rotor assembly 200 is connected to the outer ring 310 of the bearing 300 along the axial direction X. Alternatively, the stator assembly 100 is sleeved outside the rotor assembly 200, the rotor assembly 200 is connected to the inner ring 320 of the bearing 300 along the axial direction X, and the stator assembly 100 is connected to the outer ring 310 of the bearing 300 along the axial direction X. The bearing 300 can be a crossed roller bearing or a double-row angular contact bearing, and is not limited thereto. Bearing 300 can withstand radial Y and axial X loads, as well as a certain bending moment.

[0066] In one embodiment, the motor assembly 10 is a hollow motor, with its stator assembly 100 serving as a fixed component, fixed to the outer ring 310 of the bearing 300. The rotor assembly 200 serves as a rotating component, fixed to the inner ring 320 of the bearing 300, which can improve the stiffness of the rotor yoke 210.

[0067] In one embodiment, the outer ring 310 of the bearing 300 protrudes beyond the inner ring 320 towards the stator assembly 100, and a third mounting groove (not shown in the figure) is provided on the end face of the outer ring 310 facing the stator assembly 100. The stator assembly 100 is at least partially disposed in the third mounting groove and spaced apart from the inner ring 320. A fourth mounting groove (not shown in the figure) is provided on the side of the inner ring 320 facing the rotor assembly 200. The rotor assembly 200 is fitted with the fourth mounting groove to improve the coaxiality of the inner ring 320 and the rotor assembly 200. The rotor assemblies 200 can be connected to each other using studs.

[0068] In one embodiment, the size of the stator assembly 100 is smaller than the size of the rotor assembly 200 along the axial direction XX of the rotor yoke 210 or along the axial direction X of the bearing 300.

[0069] In one embodiment, the isolation ring 230 is located on the side of the magnet 220 away from the bearing. The isolation ring 230 can prevent the magnet 220 from being exposed, thereby blocking foreign objects, especially ferromagnetic materials, from being attracted into the rotor assembly 200, thus playing the role of preventing foreign objects and reducing magnetic leakage.

[0070] This application provides an electronic device (not shown in the figure) that includes a motor assembly 10. The motor assembly 10 can be any of the motor assemblies described in the above embodiments, and is not limited thereto. The electronic device can be a computed tomography (CT) scanner, a robotic arm, a collaborative robot, etc., and is not limited thereto.

[0071] In one embodiment, the electronic device is a CT scanner. When the motor assembly 10 is applied to the CT scanner, the rotor assembly 200 operates at a relatively low speed. According to electromagnetic calculations, the centrifugal force of the rotor assembly 200 during operation is less than the attractive force between the magnet 220 and the rotor yoke 210, while the attractive force between the magnet 220 and the rotor yoke 210 is greater than the centrifugal force during the operation of the rotor yoke 210. Therefore, even if the adhesive between the magnet 220 and the rotor yoke 210 fails, the magnet 220 will not fly off radially (Y) along the rotor yoke 210. Simultaneously, due to the presence of the limiting part and the second isolation part, adjacent magnets 220 will not be attracted together circumferentially (Z) along the rotor yoke 210. Furthermore, due to the presence of the first isolation part and the limiting ring, the magnet 220 will not move axially (X) along the rotor yoke 210. Therefore, the rotor assembly 200 provided in this application can eliminate the greatest safety hazard of the motor assembly in the CT scanner and improve the reliability of the CT scanner's operation.

[0072] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A rotor assembly, wherein, The rotor assembly includes: Rotor yoke; A magnet is disposed on a first side of the rotor yoke, the first side being configured to face the stator assembly; An isolation ring is disposed on the first side and is located at least at the end of the magnet in the axial direction of the rotor yoke, the isolation ring protruding from the magnet in a direction away from the first side.

2. The rotor assembly of claim 1, wherein, The rotor assembly includes a plurality of magnets circumferentially spaced along the rotor yoke; the isolation ring includes: A first isolation block is disposed on the first side, at least a portion of the first isolation block being located at the axial end of the magnet on the rotor yoke, and at least a portion being located between two adjacent magnets.

3. The rotor assembly of claim 2, wherein, The first isolation block includes a vertically arranged first isolation part and a limiting part. The first isolation part is located between two adjacent magnets, and the limiting part is located at the end of the magnet in the axial direction of the rotor yoke. The limiting part protrudes from the magnet in a direction away from the first side.

4. The rotor assembly of claim 3, wherein, The limiting portion includes a first limiting portion and a second limiting portion arranged along the circumferential direction, and the first limiting portion and the second limiting portion are located on opposite sides of the first isolation portion. The first limiting portion abuts against one end of the two adjacent magnets in the axial direction of the rotor yoke, and the second limiting portion abuts against the other end of the two adjacent magnets in the axial direction of the rotor yoke. The isolation ring is formed by piecing together multiple first isolation blocks.

5. The rotor assembly of claim 1, wherein, The first side is provided with a plurality of first mounting slots spaced circumferentially along the rotor yoke; The rotor assembly includes a plurality of magnets, which are respectively installed in the plurality of first mounting slots.

6. The rotor assembly of claim 1, wherein, The rotor assembly also includes: A limiting ring is provided on the first side and located at the other end of the magnet in the axial direction of the rotor yoke.

7. The rotor assembly of claim 6, wherein, The limiting ring includes a limiting strip, which is circumferentially disposed on the first side surface along the rotor yoke. The end of the limiting strip near the magnet has a plurality of second isolation portions spaced apart along the circumferential direction to form a plurality of second mounting grooves spaced apart along the circumferential direction on the first side surface. The rotor assembly includes a plurality of the magnets, and the magnets are at least partially located in the second mounting grooves.

8. The rotor assembly of any one of claims 1 to 7, wherein, The magnet and the isolation ring are respectively attached to the first side.

9. An electric machine assembly, wherein, include: The rotor assembly according to any one of claims 1 to 8; The stator assembly is magnetically coupled to the rotor assembly.

10. The electric machine assembly of claim 9, wherein, The motor assembly also includes: The bearing has a stator assembly sleeved around the rotor assembly; the stator assembly is connected to the outer ring of the bearing, and the rotor assembly is connected to the inner ring of the bearing. The outer ring protrudes from the inner ring toward the stator assembly, and a third mounting groove is provided on the end face of the outer ring toward the stator assembly. The stator assembly is at least partially disposed in the third mounting groove and is spaced apart from the inner ring. The inner ring has a fourth mounting groove on the side facing the rotor assembly, and the rotor assembly is fitted with the stop of the fourth mounting groove.

11. The electric machine assembly of claim 10, wherein, The isolation ring is located on the side of the magnet away from the bearing.

12. An electronic device, comprising: include: The motor assembly according to any one of claims 9-11.

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