Rotor assembly, motor assembly and electronic equipment

Abstract

The invention provides a rotor assembly, a motor assembly and electronic equipment. The rotor assembly comprises a rotor yoke, a magnet and an isolating ring, the magnet is arranged on a first side surface of the rotor yoke, and the first side surface is configured to face the stator assembly; the isolating ring is arranged on the first side surface and at least located at the end part of the magnet in the axial direction of the rotor yoke, and the isolating ring protrudes out of the magnet in a direction deviating from the first side surface. The rotor assembly provided by the invention can enhance the reliability of the rotor assembly and the motor assembly.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor assembly, a motor assembly, and an electronic device. Background Art

[0002] In conventional hollow motor assemblies, the rotor yoke of the motor assembly is machined to index and position the magnets. However, machining the rotor yoke results in poor rigidity of the rotor yoke, resulting in poor reliability of the rotor assembly and the motor assembly. Summary of the Invention

[0003] The present application provides a rotor assembly, a motor assembly and an electronic device to solve the technical problem of poor reliability of existing rotor assemblies and motor assemblies.

[0004] In order to solve the above technical problems, the present application provides a rotor assembly, which includes a rotor yoke, a magnet and an isolation ring. The magnet is arranged on the first side surface of the rotor yoke, and the first side surface is configured to face the stator assembly; the isolation ring is arranged on the first side surface and is located at least at the axial end of the magnet on the rotor yoke, and the isolation ring protrudes from the magnet in the direction away from the first side surface.

[0005] In one embodiment, the rotor assembly includes a plurality of magnets arranged at circumferential intervals along the rotor yoke; the isolation ring includes a first isolation block arranged on the first side surface, at least a portion of the first isolation block is located at the axial end of the magnet on the rotor yoke, and at least a portion of the first isolation block is located between two adjacent magnets.

[0006] In one embodiment, the first isolation block includes a first isolation portion and a limiting portion vertically arranged, the first isolation portion is located between two adjacent magnets, and the limiting portion is located at the axial end of the magnet on the rotor yoke; the limiting portion protrudes from the magnet in a direction away from the first side surface.

[0007] In one embodiment, 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 isolating portion, the first limiting portion abuts against one end portion of the two adjacent magnets in the axial direction of the rotor yoke, and the second limiting portion abuts against the other end portion of the two adjacent magnets in the axial direction of the rotor yoke; the isolating ring is formed by a plurality of first isolating blocks pieced together in a circle.

[0008] In one embodiment, the first side surface is provided with a plurality of first mounting grooves spaced apart along the circumferential direction of the rotor yoke; the rotor assembly includes a plurality of magnets respectively mounted in the plurality of first mounting grooves.

[0009] In one embodiment, the rotor assembly further includes a limiting ring, which is provided on the first side surface and located at the other end portion of the magnet in the axial direction of the rotor yoke.

[0010] In one embodiment, the limiting ring includes a limiting bar, which is arranged on the first side surface along the circumference of the rotor yoke, and a plurality of second isolation portions are formed on one end of the limiting bar close to the magnet, so as to form a plurality of second mounting grooves arranged along the circumference on the first side surface, and the rotor assembly includes a plurality of magnets, which are at least partially located in the second mounting grooves.

[0011] In one embodiment, the magnet and the isolation ring are respectively adhered to the first side surface.

[0012] In order to solve the above technical problems, the present application provides a motor assembly, which includes a rotor assembly and a stator assembly, and the stator assembly and the rotor assembly are magnetically coupled.

[0013] In one embodiment, the motor assembly further includes a bearing, and the stator assembly is sleeved outside 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 surface of the outer ring facing the stator assembly, and the stator assembly is at least partially provided in the third mounting groove and spaced apart from the inner ring; a fourth mounting groove is provided on the side of the inner ring facing the rotor assembly, and the rotor assembly is provided in cooperation with the stop of the fourth mounting groove.

[0014] In one embodiment, the spacer ring is located on a side of the magnet facing away from the bearing.

[0015] In order to solve the above technical problems, the present application provides an electronic device, which includes the above motor assembly.

[0016] The beneficial effects of the present application are as follows: the rotor assembly of the present application includes a rotor yoke, a magnet, and an isolation ring, wherein the magnet is provided on a first side surface of the rotor yoke facing the stator assembly to achieve magnetic coupling between the rotor assembly and the stator assembly; the isolation ring is provided on the first side surface and is at least located at the end of the magnet in the axial direction of the rotor yoke, so that the isolation ring can limit the movement of the magnet relative to the rotor yoke in the axial direction of the rotor yoke; in addition, the isolation ring protrudes from the magnet in a direction away from the first side surface, so that the isolation ring can reduce the magnetic leakage of the magnet in the axial direction of the rotor yoke; in addition, the rotor yoke of the present application does not require additional structural processing such as positioning and indexing, and its processing is simple, which can improve the processing accuracy of the rotor yoke and enhance the reliability of the rotor yoke, thereby enhancing the reliability of the rotor assembly. Therefore, the rotor assembly of the present application can enhance the reliability of the rotor assembly and the motor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0018] Figure 1 is a structural schematic diagram of an embodiment of a rotor assembly provided by the present application;

[0019] Figure 2 This is a schematic structural diagram of an embodiment of a magnet assembly provided by the present application;

[0020] Figure 3 is a structural schematic diagram of another embodiment of a magnet assembly provided by the present application;

[0021] Figure 4 This is a schematic structural diagram of an isolation ring embodiment provided by the present application;

[0022] Figure 5 is a structural schematic diagram of another embodiment of the isolation ring provided by the present application;

[0023] Figure 6 is a structural schematic diagram of an embodiment of a motor assembly provided by the present application;

[0024] Figure 7 yes Figure 6 A cross-sectional schematic diagram of an embodiment of a motor assembly according to an embodiment.

[0025] Figure markings: 10-motor assembly; 100-stator assembly; 200-rotor assembly; 210-rotor yoke; 220-magnet; 230-isolating ring; 231-first isolating block; 2311-first isolating portion; 2312-limiting portion; 2312a-first isolating portion; 2312b-second isolating portion; 241-limiting bar; 2411-second isolating portion; 2412-second mounting groove; 300-bearing; 310-outer ring; 320-inner ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] This application provides a rotor assembly, see Figures 1 to 5 , Figure 1 is a structural schematic diagram of an embodiment of a rotor assembly provided by the present application; Figure 2 This is a schematic structural diagram of an embodiment of a magnet assembly provided by the present application; Figure 3 is a structural schematic diagram of another embodiment of a magnet assembly provided by the present application; Figure 4 This is a schematic structural diagram of an isolation ring embodiment provided by the present application; Figure 5 FIG. 2 is a schematic structural diagram of another embodiment of an isolating ring provided in the present application. The rotor assembly 200 includes a rotor yoke 210 , a magnet 220 and an isolating ring 230 .

[0030] The rotor yoke 210 is also called the rotor core. The main function of the rotor yoke 210 is to transfer magnetic flux, support and fix the magnet 220. In addition, the rotor yoke 210 can also play the role of the motor shaft for transmitting torque. Specifically, the rotor yoke 210 is an annular rotor yoke 210. The first side surface of the rotor yoke 210 is configured to face the stator assembly 100. For example, the first side surface can be the inner side surface of the rotor yoke 210, or the first side surface can be the outer side surface opposite to the inner side surface of the rotor yoke 210, which is not limited here. Among them, the rotor yoke 210 is made of a ferromagnetic material with high magnetic permeability, such as silicon steel sheet, low carbon steel, etc., which is not limited here. The magnet 220 is arranged on the first side surface to magnetically couple the rotor assembly 200 and the stator assembly 100.

[0031] The isolating ring 230 is disposed on the first side surface and is located at least at the end of the magnet 220 in the axial direction X of the rotor yoke 210. The isolating ring 230 protrudes from the magnet 220 in a direction away from the first side surface. It will be appreciated that the end of the magnet 220 in the axial direction X of the rotor yoke 210 is at least partially blocked by the isolating ring 230. Therefore, the isolating ring 230 can limit the movement of the magnet 220 relative to the rotor yoke 210 in the axial direction X of the rotor yoke 210. Furthermore, the end blocked by the isolating ring 230 is completely blocked by the isolating ring 230 in the radial direction Y of the rotor yoke 210. Therefore, the isolating ring 230 can reduce magnetic flux leakage from the magnet 220 in the axial direction X of the rotor yoke 210. The isolating ring 230 can be located at any end of the magnet 220 in the axial direction X of the rotor yoke 210, without limitation. The isolating ring 230 can be formed as part of the rotor yoke 210, or it can be a separate component, without limitation. The isolation ring 230 may be a single structure, or the isolation ring 230 may be a structure formed by splicing multiple substructures, which is not limited here.

[0032] The rotor assembly 200 of the present application includes a rotor yoke 210, a magnet 220 and an isolation ring 230, wherein the magnet 220 is arranged on the 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 arranged on the first side and is at least located at the end of the magnet 220 in the axial direction X of the rotor yoke 210, so that the isolation ring 230 can limit 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 the direction away from the first side, so that the isolation ring 230 can reduce the leakage magnetic flux of the magnet 220 in the axial direction X of the rotor yoke 210, and can enhance the reliability of the rotor assembly 200, thereby enhancing the reliability of the motor assembly. In addition, the rotor yoke 210 of the present application does not need to be processed into a structure for indexing and positioning the magnet 220. Its processing is simple, which can improve the processing accuracy of the rotor yoke 210 and enhance the reliability of the rotor yoke 210. Further, it can reduce the processing cost of the rotor yoke 210.

[0033] In one embodiment, the rotor assembly 200 includes a plurality of magnets 220 spaced apart along the circumferential direction Z of the rotor yoke 210. Specifically, the magnets 220 of different polarities are arranged crosswise. For example, the plurality of magnets 220 are arranged in the order of N pole, S pole, N pole, and S pole along the circumferential direction Z of the rotor yoke 210. The isolation ring 230 includes a first isolation block 231, which is disposed on the first side. At least a portion of the first isolation block 231 is located at the end of the magnet 220 in the axial direction X of the rotor yoke 210 to limit the position of the magnet 220 in the axial direction X 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. That is, the isolation ring 230 of this embodiment can achieve isolation between two adjacent magnets 220 by setting the first isolation block 231, and at the same time achieve the limitation of the magnet 220 in the axial direction X of the rotor yoke 210. That is, the isolation ring 230 of this embodiment can achieve the positioning, indexing and isolation of the magnet 220, enhance the practicality of the isolation ring 230, reduce the use of additional indexing parts, and reduce the cost of the rotor assembly 200.

[0034] In one embodiment, see Figure 4 The first isolation block 231 includes a vertically arranged first isolation portion 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 in the axial direction X of the rotor yoke 210 to achieve position limiting of the magnet 220 in the axial direction X 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.

[0035] The first isolation block 231 of this embodiment includes a vertically arranged first isolation portion 2311 and a limiting portion 2312 . It has a simple structure and is easy to process, which can reduce the processing cost of the first isolation block 231 and thus reduce the cost of the rotor assembly 200 .

[0036] In one embodiment, the limiting portion 2312 protrudes from the magnet 220 in a direction away from the first side surface, that is, along the radial direction Y of the rotor yoke 210. The limiting portion 2312 can completely cover the end of the magnet 220 in the radial direction Y of the rotor yoke 210, so that the limiting portion 2312 can reduce the leakage magnetic flux of the magnet 220 and enhance the reliability of the motor assembly; the limiting portion 2312 can also enhance the limiting effect of the magnet 220 in the axial direction X of the rotor yoke 210.

[0037] In one embodiment, the limiting portion 2312 abuts against the end of the magnet 220 in the axial direction X of the rotor yoke 210, which can reduce the gap between the limiting portion 2312 and the rotor yoke 210, further reduce the leakage magnetic flux of the magnet 220, and further enhance the limiting effect of the limiting portion 2312 on the magnet 220 in the axial direction X of the rotor yoke 210.

[0038] In one embodiment, the first isolating portion 2311 and the limiting portion 2312 are integrally formed to reduce the installation process of the rotor assembly 200 and lower the difficulty of assembling the rotor assembly 200 .

[0039] In one embodiment, the isolation ring 230 is formed of a circular structure composed of multiple 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 along the circumferential direction Z. The first limiting portion 2312a and the second limiting portion 2312b are located on opposite sides of the first isolation block 2311. The first limiting portion 2312a, the second limiting portion 2312b, and the first isolation block 2311 are arranged in a "T" shape. The first limiting portion 2312a abuts one end of two adjacent magnets 220 in the axial direction X of the rotor yoke 210, and the second limiting portion 2312b abuts the other end of two adjacent magnets 220 in the axial direction X of the rotor yoke 210. In other words, a single first isolation block 231 can separate two adjacent magnets 220, limit the position of the two adjacent magnets 220 in the axial direction X of the rotor yoke 210, and reduce magnetic flux leakage. In addition, the isolation ring 230 is formed by a plurality of first isolation blocks 231 arranged in a circle, which can reduce the difficulty of assembling the isolation ring 230 .

[0040] In one embodiment, the first isolation block 231 can be made of non-metallic materials such as plastic, nylon, epoxy glass cloth board, etc., which is not limited here.

[0041] In one embodiment, the number of the first isolation blocks 231 corresponds to the number of the magnets 220 .

[0042] In one embodiment, the first side surface of the rotor yoke 210 is provided with a plurality of first mounting grooves (not labeled in the figure) spaced apart along the circumferential direction Z of the rotor yoke 210. A plurality of magnets 220 are respectively mounted in the plurality of first mounting grooves. The first mounting grooves may be recessed portions (not labeled in the figure) and raised portions (not labeled in the figure) machined on the surface of the first side surface of the rotor yoke 210, and the magnets 220 may be mounted in the recessed portions. Alternatively, the first mounting groove may be the space formed along the circumferential direction Z of the rotor yoke 210 by the first isolation portions 2311 of two adjacent first isolation blocks 231, which is not limited here.

[0043] The rotor yoke 210 of this embodiment is provided with a plurality of first mounting grooves on the first surface thereof, which are arranged at intervals and used to mount a plurality of magnets 220 . The first mounting grooves can index and position the magnets 220 .

[0044] In one embodiment, the rotor assembly 200 further includes a retaining ring (not labeled in the figure), which is disposed on the first side surface 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 retaining ring can be the same as that of any of the aforementioned embodiments of the isolation ring 230, or the retaining ring can be an annular collar, etc., which is not limited here.

[0045] It can be understood that in the rotor assembly 200 of this embodiment, 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 of the rotor yoke 210, it is limited by the limiting ring or the isolation ring 230 in the moving direction. Even if the fixing effect between the magnet 220 and the first surface of the rotor yoke 210 fails, no axial X movement will occur. In addition, the limiting ring or the isolation ring 230 can also prevent the magnet 220 from being exposed, thereby preventing foreign matter, especially foreign matter made of ferromagnetic material, from being sucked into the interior of the rotor assembly 200, thereby preventing foreign matter and reducing magnetic leakage.

[0046] In one embodiment, the limiting ring includes a limiting strip 241. The limiting strip 241 is arranged on the first side surface along the circumferential direction Z of the rotor yoke 210. Particularly, a plurality of second isolating portions 2411 arranged at intervals along the circumferential direction Z of the rotor yoke 210 are formed at one end of the limiting strip 241 close to the magnet 220. The intervals between two adjacent second isolating portions 2411 form second mounting grooves 2412. The plurality of second mounting grooves 2412 are arranged at intervals along the circumferential direction Z of the rotor yoke 210. Particularly, the magnet 220 is at least partially located in the second mounting groove 2412, that is, along the axial direction X of the rotor yoke 210, the size of the second isolating portion 2411 is less than or equal to the size of the magnet 220 in the axial direction X of the rotor yoke 210.

[0047] The limiting ring of this embodiment includes a limiting bar 241, and a plurality of second isolation portions 2411 are formed at one end of the limiting bar 241 close to the magnet 220 and arranged at intervals along the circumferential Z direction of the rotor yoke 210. The interval between two adjacent second isolation portions 2411 forms a second installation groove 2412 for installing the magnet 220. That is, the rotor assembly 200 of this embodiment can also index the magnet 220 through the limiting bar 241, and there is no need to additionally process the installation groove for indexing and positioning the magnet 220 on the first side surface of the rotor yoke 210, which can enhance the strength of the rotor yoke 210 and thus enhance the reliability of the motor assembly.

[0048] In one embodiment, the limiting ring can be formed by splicing multiple limiting strips 241 into a full circle, or by splicing a linear limiting strip 241 into a full circle, or the limiting ring can be formed by a ring-shaped limiting strip 241, which is not limited here.

[0049] In one embodiment, the limiting ring is formed by splicing a linear limiting strip 241 into a full circle, wherein the length of the splicing strip is greater than or equal to the circumference of the outer periphery of the first plane of the rotor yoke 210 .

[0050] In one embodiment, the limiting ring can be spliced ​​into a whole circle by multiple limiting bars 241. Different numbers of limiting bars 241 are selected according to the radial size of the rotor yoke to form a limiting ring. The limiting ring is spliced ​​into a circle by multiple limiting bars 241, which can be compatible with rotor yokes 210 of different radial sizes and can reduce the development cycle of the limiting ring.

[0051] In one embodiment, the limiting strip 241 can be formed by molding or 3D printing of non-metallic materials such as plastic and nylon, which is not limited here.

[0052] In one embodiment, the magnet 220 and the isolation ring 230 are respectively attached to the first side surface of the rotor yoke 210 . The arrangement of the magnet 220 and the isolation ring 230 is simple, which can reduce the difficulty of assembling the rotor assembly 200 .

[0053] In one embodiment, the retaining ring includes a collar (not shown) that is disposed on the first side surface and is located at the other end of the magnet 220 relative to the isolation ring 230 in 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, thereby limiting the movement of the magnet 220 relative to the rotor yoke 210 toward the side where the collar is located along the rotor axial direction X. Furthermore, the abutment between the collar and the end of the magnet 220 reduces magnetic flux leakage from the magnet 220.

[0054] In one embodiment, the ring may be a plastic ring, a nylon ring, or other ring having a magnetic isolation function, which is not limited here.

[0055] In one embodiment, the magnet 220 is made of a permanent magnetic material such as neodymium iron boron, samarium cobalt, or ferrite, or the magnet 220 may also be made of an electrically excited solution, which is not limited here.

[0056] In one embodiment, the rotor assembly 200 of the present application is assembled as follows: First, the limiting bar 241 is attached to the outer surface of the rotor yoke 210, and then the magnet 220 is installed into the second mounting slot 2412 of the limiting bar 241 and pushed to the bottom limit. After the limiting bar 241 has attached the two magnets 220, a first isolation block 231 can be installed and attached to the rotor yoke 210 and magnets 220 to secure them. The first isolation portion 2311 can be inserted between the two magnets 220 to separate and position them.

[0057] In one embodiment, after the magnet 220 and the first isolation block 231 are assembled, the limiting bar 241 can be removed so that the limiting bar 241 can be reused.

[0058] This application provides a motor assembly, see Figures 6 and 7 , Figure 6 is a structural schematic diagram of an embodiment of a motor assembly provided by the present application; Figure 7 yes Figure 6 The motor assembly of the embodiment is a schematic cross-sectional view of an embodiment of the motor assembly. The motor assembly 10 includes a rotor assembly 200 and a stator assembly 100. The stator assembly 100 is magnetically coupled to the rotor assembly 200. The rotor assembly 200 can be any of the rotor assemblies 200 in the above embodiments of the rotor assembly 200, and is not limited here.

[0059] In one embodiment, the motor assembly 10 further includes a bearing 300, which includes an outer ring 310 and an inner ring 320. The outer ring 310 is located outside the inner ring 320 and is coaxially arranged with the inner ring 320. 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, with the stator assembly 100 connected to the inner ring 320 of the bearing 300 along the axial direction X of the bearing 300, 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, with the rotor assembly 200 connected to the inner ring 320 of the bearing 300 along the axial direction X of the bearing 300, 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, without limitation. The bearing 300 can withstand radial loads Y and axial loads X, and can also withstand a certain bending moment.

[0060] In one embodiment, the motor assembly 10 is a hollow motor, wherein the stator assembly 100 is fixed to the outer ring 310 of the bearing 300 as a fixed component. The rotor assembly 200 is fixed to the inner ring 320 of the bearing 300 as a rotating component, which can improve the rigidity of the rotor yoke 210.

[0061] In one embodiment, the outer ring 310 of the bearing 300 is arranged to protrude beyond the inner ring 320, facing the stator assembly 100. A third mounting groove (not shown) is provided on the end surface of the outer ring 310 facing the stator assembly 100. The stator assembly 100 is at least partially disposed within the third mounting groove and spaced apart from the inner ring 320. A fourth mounting groove (not shown) is provided on the side of the inner ring 320 facing the rotor assembly 200. The rotor assembly 200 is configured to mate with the stop of the fourth mounting groove to improve the coaxiality between the inner ring 320 and the rotor assembly 200. The rotor assembly 200 can be connected to the rotor assembly 200 via studs.

[0062] In one embodiment, along the axial direction XX of the rotor yoke 210 or along the axial direction X of the bearing 300 , the size of the stator assembly 100 is smaller than that of the rotor assembly 200 .

[0063] In one embodiment, the isolation ring 230 is located on the side of the magnet 220 facing away from the bearing, so that the isolation ring 230 can prevent the magnet 220 from being exposed, so that the isolation ring 230 can prevent foreign matter, especially foreign matter made of ferromagnetic materials, from being sucked into the interior of the rotor assembly 200, thereby preventing foreign matter and reducing magnetic leakage.

[0064] The present application provides an electronic device (not shown), which includes a motor assembly 10. The motor assembly 10 can be any of the motor assemblies 10 described above, without limitation. The electronic device can be a computed tomography (CT) device, a robotic arm, a collaborative robot, or the like, without limitation.

[0065] In one embodiment, the electronic device is a CT device. When the motor assembly 10 is used in the CT device, the rotational speed of the rotor assembly 200 is relatively low. According to electromagnetic calculation results, 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, and 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 out in the radial direction Y of the rotor yoke 210. At the same time, due to the presence of the limiting portion and the second isolating portion, two adjacent magnets 220 will not be attracted together in the circumferential direction Z of the rotor yoke 210. Due to the presence of the first isolating portion and the limiting ring, the magnet 220 will not move in the axial direction X of the rotor yoke 210. Therefore, the rotor assembly 200 provided in this application can eliminate the greatest safety hazard of the motor assembly of the CT device and improve the reliability of the operation of the CT device.

[0066] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: rotor yoke; a magnet disposed on a first side of the rotor yoke, the first side being configured to face the stator assembly; The isolating ring is provided on the first side surface and is located at least at an end portion of the magnet in the axial direction of the rotor yoke. The isolating ring protrudes from the magnet in a direction away from the first side surface.

2. The rotor assembly according to claim 1, wherein: The rotor assembly includes a plurality of magnets spaced apart along the circumference of the rotor yoke; the isolation ring includes: A first isolation block is provided on the first side surface. At least a portion of the first isolation block is located at an axial end of the magnet on the rotor yoke, and at least a portion of the first isolation block is located between two adjacent magnets.

3. The rotor assembly according to claim 2, wherein: The first isolation block includes a first isolation portion and a limiting portion arranged vertically, 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 surface.

4. The rotor assembly according to 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 isolating portion, the first limiting portion abuts against one end portion of the two adjacent magnets in the axial direction of the rotor yoke, and the second limiting portion abuts against the other end portion of the two adjacent magnets in the axial direction of the rotor yoke; The isolation ring is formed by piecing together a plurality of the first isolation blocks.

5. The rotor assembly according to claim 1, wherein: The first side surface is provided with a plurality of first mounting grooves spaced apart along the circumferential direction of the rotor yoke; The rotor assembly includes a plurality of magnets respectively installed in the plurality of first installation slots.

6. The rotor assembly according to claim 1, wherein: The rotor assembly further comprises: A limiting ring is provided on the first side surface and is located at the other end portion of the magnet in the axial direction of the rotor yoke.

7. The rotor assembly according to claim 6, wherein: The limiting ring includes a limiting bar, which is arranged on the first side surface along the circumference of the rotor yoke. The limiting bar is formed with a plurality of second isolation portions arranged at intervals along the circumference at one end close to the magnet to form a plurality of second mounting grooves arranged at intervals along the circumference 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.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: The magnet and the isolation ring are respectively adhered to the first side surface.

9. A motor assembly, characterized in that: include: The rotor assembly according to any one of claims 1 to 8; The stator assembly is magnetically coupled with the rotor assembly.

10. The motor assembly according to claim 9, characterized in that The motor assembly further comprises: The 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 is arranged to protrude from the inner ring toward the stator assembly, and a third mounting groove is provided on the end surface of the outer ring facing the stator assembly. The stator assembly is at least partially disposed in the third mounting groove and spaced apart from the inner ring. A fourth mounting groove is provided on a side of the inner ring facing the rotor assembly, and the rotor assembly is matched with a stopper of the fourth mounting groove.

11. The motor assembly according to claim 10, wherein: The isolation ring is located on a side of the magnet facing away from the bearing.

12. An electronic device, characterized in that: include: The motor assembly according to any one of claims 9 to 11.

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