Rotor, motor, steering system and vehicle

Abstract

The utility model provides a rotor, a motor, a steering system and a vehicle. Wherein the rotor comprises a rotor iron core; the plurality of retainers are arranged on the peripheral side of the rotor iron core, the plurality of retainers are arranged at intervals along the circumferential direction of the rotor, a mounting groove with an opening is enclosed between two adjacent retainers and the rotor iron core, the opening is arranged opposite to the peripheral wall of the rotor iron core, and first grooves are formed in the radial outer surfaces of at least one part of the plurality of retainers; each permanent magnet is arranged in the corresponding mounting groove, and one part of each permanent magnet protrudes out of the corresponding mounting groove through the corresponding opening; the fixing sleeve is arranged on the outer sides of the multiple holding pieces in a sleeving mode, the fixing sleeve is provided with multiple protruding parts, the number of the protruding parts is smaller than or equal to the number of the first grooves, each protruding part is embedded into one first groove, and the part, protruding out of the mounting groove, of the permanent magnet is attached to the inner circumferential wall of the fixing sleeve. The permanent magnets can be fastened and limited in the circumferential direction and the radial direction of the rotor, and noise of the motor can be effectively restrained.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, and more specifically, to a rotor, an electric motor, a steering system, and a vehicle. Background Technology

[0002] In related technologies, surface-mount rotors include annular wound tapes that are bonded to the outer circumference of the rotor's permanent magnets using adhesive. This arrangement carries the risk of the adhesive detaching, resulting in low safety and reliability of the motor. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this application proposes a rotor.

[0005] The second aspect of this application proposes an electric motor.

[0006] The third aspect of this application proposes a steering system.

[0007] The fourth aspect of this application proposes a vehicle.

[0008] In view of the above, a first aspect of this application provides a rotor, comprising: a rotor core; a plurality of retaining members disposed on the outer periphery of the rotor core, the plurality of retaining members being arranged at intervals along the circumference of the rotor, wherein an open mounting groove is formed between two adjacent retaining members and the rotor core, the opening being disposed opposite to the outer peripheral wall of the rotor core, and at least a portion of the retaining members having a first groove on their radial outer surface; a plurality of permanent magnets, each permanent magnet being disposed in a mounting groove, and a portion of the permanent magnet protruding out of the mounting groove through the opening; and a fixing sleeve disposed on the outside of the plurality of retaining members, the fixing sleeve having a plurality of protrusions, the number of protrusions being less than or equal to the number of first grooves, each protrusion being embedded in a first groove, and the portion of the permanent magnet protruding out of the mounting groove being fitted against the inner peripheral wall of the fixing sleeve.

[0009] The rotor provided in this application includes a rotor core, multiple retainers, multiple permanent magnets, and a fixing sleeve.

[0010] Any one of the multiple retainers is located on the outer periphery of the rotor core. Adjacent retainers and the rotor core enclose an open mounting slot; that is, the multiple retainers and the rotor core enclose multiple mounting slots. Each mounting slot contains a permanent magnet, a portion of which protrudes from the mounting slot through the opening. The shape of the permanent magnet matches the shape of the mounting slot.

[0011] At least a portion of the retainers have a first groove on their radial outer surface; that is, each retainer has a first groove on its radial outer surface. Alternatively, a portion of the retainers have a first groove on their radial outer surface.

[0012] After assembling multiple retaining members and multiple permanent magnets onto the outer periphery of the rotor core, a fixing sleeve substrate is fitted onto the outside of the retaining members. A press is used to compress the fixing sleeve substrate along its outer to inner periphery, causing a portion of the substrate to be pressed into a first groove to form a protrusion. Essentially, the portion of the fixing sleeve substrate located within the first groove is the protrusion, and the protrusion and the first groove are fitted together. During the pressing process, the portion of the fixing sleeve located between two adjacent first grooves shrinks, pressing the fixing sleeve tightly against the outside of the multiple permanent magnets, so that the portion of the permanent magnets protruding from the mounting groove fits snugly against the inner periphery of the fixing sleeve.

[0013] The fixing sleeve, multiple retaining parts, and rotor core work together to secure and limit multiple permanent magnets in the circumferential and radial directions of the rotor, ensuring that the permanent magnets are firmly assembled onto the rotor core. This prevents the permanent magnets from becoming loose due to assembly errors, guarantees the assembly dimensions of the permanent magnets and rotor core, effectively increases the reliability of the motor, and suppresses motor noise.

[0014] Furthermore, the protrusion of the retaining sleeve is embedded in the first groove of the retaining member. The cooperation between the protrusion and the first groove prevents the retaining sleeve from moving circumferentially on the rotor, thus further suppressing motor noise. This further enhances the product's performance and market competitiveness.

[0015] The device is fitted with a plurality of protrusions, the number of which is less than or equal to the number of first grooves, and each protrusion is embedded in one first groove. When the number of protrusions is less than the number of first grooves, some of the first grooves are equipped with protrusions, while others are not. In other words, not every first groove is equipped with a protrusion.

[0016] Optionally, when each retainer has a first groove on its radial outer surface, and the number of protrusions is less than the number of first grooves, since each retainer has a first groove, the assembly difficulty of the rotor core and multiple retainers is simplified, and it is not necessary to mark the assembly position of the retainers with the first grooves. This arrangement, while ensuring the assembly dimensions of multiple permanent magnets and the rotor core, helps to reduce the assembly difficulty of the rotor, improve the assembly efficiency of the rotor, and reduce the production cost of the product. The rotor according to the present invention may also have the following additional technical features:

[0017] In some embodiments, the radial outer surface of the retainer is optionally spaced apart from the inner peripheral wall of the retaining sleeve.

[0018] In this embodiment, the mating structure of the retainer and the fixing sleeve is further defined.

[0019] Specifically, the radial outer surface of the retainer is spaced apart from the inner peripheral wall of the fixed sleeve. That is, along the radial direction of the rotor, there is a gap between the retainer and the inner peripheral wall of the fixed sleeve, and the radial outer surface of the retainer and the inner peripheral wall of the fixed sleeve are not fitted together.

[0020] This design ensures the effectiveness of multiple retainers in securing the permanent magnets between the retainers and the rotor core, while also reducing the precision requirements for the machining of the retainers and permanent magnets, thus guaranteeing the reliability of the rotor assembly. If the radial outer surface of the retainer is fitted against the inner circumferential wall of the fixing sleeve, the machining precision requirements for the retainer are higher. This is because if the distance from the radial outer surface of the retainer to the rotor core is greater than the distance from the radial outer surface of the permanent magnet to the rotor core, the inner circumferential wall of the fixing sleeve cannot effectively fit against the outer circumferential wall of the permanent magnet, thus failing to achieve the purpose of clamping the multiple permanent magnets, resulting in the permanent magnets becoming loose.

[0021] It is understandable that the radial outer surface of the retainer is spaced apart from the inner circumferential wall of the fixed sleeve, that is, the distance from the radial outer surface of the retainer to the rotor core is less than the distance from the inner circumferential wall of the fixed sleeve to the rotor core.

[0022] In some embodiments, the plurality of retainers may optionally include a plurality of first retainers and a plurality of second retainers, wherein the first retainer is provided with a first groove and at least one second retainer is disposed between two adjacent first retainers.

[0023] In this embodiment, the types of multiple retaining members are divided, including multiple first retaining members and multiple second retaining members. The first retaining members are provided with a first groove, while the second retaining members are not provided with a first groove.

[0024] At least one second retainer is provided between two adjacent first retainers, that is, two adjacent first retainers are arranged at intervals through at least one second retainer.

[0025] This design not only ensures the effective positioning of the fixed sleeve and multiple retainers, but also reduces the pressing area of ​​the fixed sleeve substrate, reduces the processing steps of multiple retainers, improves the processing efficiency of the fixed sleeve, and helps to reduce the processing cost of the rotor.

[0026] In addition, this design allows the fixed sleeve to be effectively pressed into the first groove of the first retaining member at different positions, ensuring the balance and consistency of the force on the fixed sleeve at different positions, and effectively limiting the fixed sleeve in the circumferential direction of the rotor.

[0027] In some embodiments, optionally, a plurality of first grooves are arranged at equal intervals along the circumference of the rotor.

[0028] In this embodiment, the distribution structure of the multiple retainers is further defined.

[0029] Multiple first grooves are arranged at equal intervals along the circumference of the rotor. This arrangement can ensure the balance and consistency of the force at different positions of the fixing sleeve and effectively limit the fixing sleeve in the circumference of the rotor.

[0030] It is understandable that a receiving groove is formed between two adjacent first retainers and the rotor core, that is, multiple first retainers and the rotor core form multiple receiving grooves, and the same number of second retainers are provided in any two adjacent receiving grooves.

[0031] In some embodiments, the retainer may optionally include: a connecting segment having a first wall and a second wall disposed opposite to each other in the radial direction of the rotor, the first wall being located between the rotor core and the second wall, the first wall being disposed in contact with the radial outer surface of two adjacent permanent magnets; and a connecting segment extending from the connecting segment toward the rotor core, the connecting segment being sandwiched between two adjacent permanent magnets, the rotor core having a second groove, the end of the connecting segment being inserted into the second groove.

[0032] In this embodiment, the structure of the retainer is further defined.

[0033] The retaining element includes a connecting section and a connecting segment. The connecting segment extends towards the rotor core from the connecting segment, and the end of the connecting segment opposite to the connecting segment is inserted into a second groove.

[0034] Along the radial direction of the rotor, the retainer includes a first wall and a second wall, which are disposed opposite to each other. The first wall is located between the rotor core and the second wall.

[0035] An installation groove is formed between the first wall surface of two adjacent retainers, the connecting section, and the rotor core, and an opening is formed between the second wall surface of two adjacent retainers.

[0036] The first wall surface is set to fit the radial outer surface of two adjacent permanent magnets. The connecting section is sandwiched between two adjacent permanent magnets. The connecting section, rotor core and connecting section cooperate to limit the permanent magnets in the circumferential and radial directions of the rotor, so as to ensure the matching dimensions of multiple permanent magnets and rotor core.

[0037] It is understandable that the first wall and the side wall of the connecting section extend in different directions. The side of the first wall and the connecting section are slots that engage with the outer surface of the permanent magnet, so as to effectively limit the permanent magnet between the rotor core and the retainer.

[0038] In some embodiments, optionally, the shape of the end of the connecting segment is the same as the shape of the second groove, and the cross-sectional area of ​​the bottom of the second groove is greater than the cross-sectional area of ​​the area enclosed by the opening of the second groove; wherein, along the axial direction of the rotor, the second groove penetrates the rotor core.

[0039] In this embodiment, the mating structure of the connecting section and the rotor core is further defined.

[0040] The rotor core has a second groove, and the end of the connecting section is inserted into the second groove. The shape of the end of the connecting section is the same as the shape of the second groove.

[0041] The cross-sectional area of ​​the bottom of the second groove is larger than the cross-sectional area of ​​the area enclosed by the opening of the second groove. That is, the second groove is a groove-shaped structure with a small opening and a large bottom. When the end of the connecting section is inserted into the second groove, it can be effectively limited along the radial and circumferential limiting and retaining parts of the rotor core, thus preventing the permanent magnet from shifting relative to the rotor core.

[0042] In addition, the second groove extends through the rotor core along the rotor's axial direction. This design allows for effective assembly of the retainer and the rotor core, offering advantages in ease of operation and improving assembly efficiency and feasibility.

[0043] In some embodiments, the first groove and the connecting segment are optionally disposed opposite to each other.

[0044] In this embodiment, the structure of the retainer is further defined such that the first groove and the connecting segment are positioned opposite each other, that is, the first groove is located in the middle of the connecting segment. This arrangement ensures the thickness of the portion of the retainer at the first groove, thus ensuring the effectiveness and feasibility of the retainer in limiting the permanent magnet.

[0045] If the first groove is located on one side of the connecting section along the circumference of the rotor, the thickness of the retainer at the first groove is relatively thin, and the retainer is prone to deformation. This will weaken the external force acting on the permanent magnet, making it easy for the permanent magnet to loosen, which will increase the operating noise of the motor.

[0046] In some embodiments, the number of protrusions may optionally be denoted as M, where 2 ≤ M ≤ 10, and M is an even number.

[0047] In this embodiment, the number of protrusions is further limited, such that the number of protrusions is denoted as M, where 2≤M≤10, and M is an even number. For example, the number of protrusions includes 4, 6, and 8.

[0048] This design ensures the proper contact area and angle between the retaining sleeve and multiple retaining elements. The retaining sleeve can compress the multiple retaining elements from multiple directions and angles, guaranteeing the balanced and consistent force on the multiple permanent magnets. It provides reliable structural support for ensuring the proper fit between the multiple permanent magnets and the rotor core.

[0049] Furthermore, this design takes into account the processing difficulty of multiple retainers, simplifies the processing steps of multiple retainers, and helps to reduce the production cost of multiple retainers.

[0050] In some embodiments, the retaining sleeve may be a non-magnetic metal sleeve.

[0051] In this embodiment, the structure of the fixing sleeve is further defined so that the fixing sleeve is a non-magnetic metal sleeve, the fixing sleeve is a metal material that will not cause significant magnetization under the action of a magnetic field, and the magnetic permeability of the fixing sleeve is low, so as not to affect the operating parameters of the motor.

[0052] Optionally, the retaining sleeve includes a stainless steel sleeve, an aluminum alloy sleeve, and a titanium alloy sleeve.

[0053] In some embodiments, the thickness of the fixing sleeve may be greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0054] In this embodiment, the structure of the fixing sleeve is further defined such that the thickness of the fixing sleeve is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. This design ensures the effectiveness and feasibility of fixing multiple permanent magnets and rotor cores while also ensuring the overall dimensions of the rotor and the overall size of the motor.

[0055] Optionally, the thickness of the fixing sleeve includes 0.2mm, 0.3mm and 0.4mm, etc., which will not be listed here.

[0056] The second aspect of this utility model provides an electric motor, comprising: a rotor as described in the first aspect.

[0057] The motor provided by this utility model includes a rotor as described in the first aspect, and therefore has all the beneficial effects of the rotor, which will not be described in detail here.

[0058] The third aspect of this utility model provides a steering system, comprising: a rotor as in the first aspect; or a motor as in the second aspect.

[0059] The steering system provided by this utility model includes a rotor as described in the first aspect, or a motor as described in the second aspect, and therefore has all the beneficial effects of the aforementioned rotor or motor, which will not be described in detail here.

[0060] The fourth aspect of this utility model provides a vehicle comprising: an electric motor as in the second aspect; or a steering system as in the third aspect.

[0061] The vehicle provided by this utility model includes a motor as described in the second aspect, or a steering system as described in the third aspect, and therefore has all the beneficial effects of the aforementioned motor or steering system, which will not be described in detail here.

[0062] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0063] The vehicles can also be gasoline-powered cars and hybrid cars.

[0064] The fifth aspect of this utility model provides a method for preparing a rotor for preparing the rotor in the first aspect. The method for preparing the rotor includes: placing a plurality of permanent magnets and a plurality of retaining members along the circumference of the rotor on the outer periphery of the rotor core; fitting a fixing sleeve substrate on the outer periphery of the plurality of retaining members; and pressing the fixing sleeve substrate with a press to form a fixing sleeve, so that the protrusion is embedded in the first groove and the portion of the permanent magnet protruding from the mounting groove is in contact with the inner peripheral wall of the fixing sleeve.

[0065] This application specifies the detailed steps of the rotor preparation method.

[0066] Multiple permanent magnets and multiple retainers are placed circumferentially on the outer periphery of the rotor core. The retainers are spaced apart circumferentially, with adjacent retainers and the rotor core forming an open mounting slot; that is, the multiple retainers and the rotor core enclose multiple mounting slots. Each mounting slot contains one permanent magnet, a portion of which protrudes from the slot through an opening. The shape of the permanent magnet matches the shape of the mounting slot.

[0067] At least a portion of the retainers have a first groove on their radial outer surface.

[0068] After assembling multiple retaining members and multiple permanent magnets onto the outer periphery of the rotor core, a fixing sleeve substrate is fitted onto the outside of the retaining members. A press is then used to press the fixing sleeve substrate along its outer to inner periphery, causing a portion of the fixing sleeve substrate to be embedded into a first groove to form a protrusion. It can be understood that the portion of the fixing sleeve substrate located within the first groove is the protrusion, and the protrusion and the first groove are fitted together. During the pressing process, the portion of the fixing sleeve located between two adjacent first grooves shrinks, thus pressing the fixing sleeve tightly against the outside of the multiple permanent magnets.

[0069] The fixing sleeve, multiple retaining parts, and rotor core work together to secure and limit multiple permanent magnets in the circumferential and radial directions of the rotor, ensuring that the permanent magnets are firmly assembled onto the rotor core. This prevents the permanent magnets from becoming loose due to assembly errors, guarantees the assembly dimensions of the permanent magnets and rotor core, effectively increases the reliability of the motor, and suppresses motor noise.

[0070] Furthermore, the protrusion of the retaining sleeve is embedded in the first groove of the retaining member. The cooperation between the protrusion and the first groove prevents the retaining sleeve from moving circumferentially on the rotor, thus further suppressing motor noise. This further enhances the product's performance and market competitiveness.

[0071] In some embodiments, the step of using a press to extrude the fixing sleeve substrate to form the fixing sleeve may specifically include: when the number of protrusions is equal to 2, using a press to extrude the fixing sleeve substrate so that a portion of the fixing sleeve substrate is simultaneously embedded in two first grooves; when the number of protrusions is greater than 2, using a press to extrude the fixing sleeve substrate in stages so that a portion of the fixing sleeve substrate is simultaneously embedded in multiple first grooves, or so that a portion of the fixing sleeve substrate is embedded in multiple first grooves in stages.

[0072] In this embodiment, the step of forming the retaining sleeve by pressing the retaining sleeve substrate with a press is further defined.

[0073] Determine the number of the first grooves.

[0074] When the number of protrusions is equal to 2, the fixing sleeve substrate is pressed by a press so that a part of the fixing sleeve substrate is simultaneously embedded in two first grooves, that is, two protrusions are simultaneously pressed and formed, and each protrusion is embedded in a first groove.

[0075] When the number of protrusions is greater than 2, the fixing sleeve substrate is pressed in stages by a press so that a part of the fixing sleeve substrate is simultaneously embedded in multiple first grooves. That is, multiple protrusions are simultaneously pressed and formed (the number of protrusions is greater than 2), and each protrusion is embedded in a first groove.

[0076] When the number of protrusions is greater than 2, the fixing sleeve substrate is pressed in stages using a press machine so that a portion of the fixing sleeve substrate is embedded into multiple first grooves in stages. That is, multiple protrusions are formed by pressing in batches (the number of protrusions is greater than 2), and each protrusion is embedded into a first groove.

[0077] For example, when there are 4 protrusions, the fixing sleeve substrate is pressed twice by a press so that a part of the fixing sleeve substrate is embedded into the 4 first grooves in stages. That is, the first pressing forms two protrusions and the second pressing forms two protrusions.

[0078] For example, when there are 6 protrusions, the fixing sleeve substrate is pressed three times by a press so that a part of the fixing sleeve substrate is embedded into the 6 first grooves in stages. That is, the first pressing forms two protrusions, the second pressing forms two protrusions, and the third pressing forms two protrusions.

[0079] During the process of pressing the fixed sleeve substrate in stages, the mechanism of the preceding pressing press needs to be held in place and cannot be released. This is to ensure the proper fit of the multiple protrusions formed by the pressing.

[0080] In some embodiments, optionally, the permanent magnet and the retainer have a gap between themselves and the inner peripheral wall of the retaining sleeve substrate along the radial direction of the rotor.

[0081] In this embodiment, the mating relationship between the permanent magnet, the retainer, and the fixing sleeve substrate is further defined.

[0082] Along the radial direction of the rotor, there is a gap between the permanent magnet and the retainer and the inner peripheral wall of the fixed sleeve substrate. That is, along the radial direction of the rotor, there is a gap between the permanent magnet and the inner peripheral wall of the fixed sleeve substrate, and there is a gap between the retainer and the inner peripheral wall of the fixed sleeve substrate.

[0083] This design allows the fixing sleeve substrate to be quickly fitted onto the outer periphery of multiple retainers, reducing the resistance between the retainer and the permanent magnet and the fixing sleeve substrate. This helps to reduce the processing accuracy requirements of the retainer and the permanent magnet and the fixing sleeve substrate, improves the assembly efficiency of the retainer and the permanent magnet and the fixing sleeve substrate, and thus reduces the production cost of the retainer and the permanent magnet and the fixing sleeve substrate.

[0084] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0085] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0086] Figure 1 A schematic diagram of the rotor core, multiple permanent magnets, multiple retainers, and fixing sleeve substrate of the first embodiment of this application is shown.

[0087] Figure 2 for Figure 1 The diagram shows the first part of the structure of the rotor core, multiple permanent magnets, multiple retainers, and the base material of the fixing sleeve.

[0088] Figure 3 for Figure 1 The diagram shows the second part of the rotor core, multiple permanent magnets, multiple retainers, and the base material of the fixing sleeve.

[0089] Figure 4 A partial structural schematic diagram of a press, rotor core, multiple permanent magnets, multiple retainers, and a fixing sleeve according to a second embodiment of this application is shown.

[0090] Figure 5 A partial structural schematic diagram of a press, rotor core, multiple permanent magnets, multiple retainers, and a fixing sleeve according to a third embodiment of this application is shown.

[0091] Figure 6 A schematic diagram of the press, rotor core, multiple permanent magnets, multiple retainers and fixing sleeve of the third embodiment of this application is shown.

[0092] Figure 7 A partial structural schematic diagram of a press, rotor core, multiple permanent magnets, multiple retainers and a fixing sleeve according to the fourth embodiment of this application is shown.

[0093] Figure 8 A partial structural schematic diagram of a press, rotor core, multiple permanent magnets, multiple retainers and a fixing sleeve according to the fifth embodiment of this application is shown.

[0094] Figure 9 for Figure 8 The diagram shows a partial structural schematic of the press, rotor core, multiple permanent magnets, multiple retainers, and fixed sleeve.

[0095] Figure 10 This is a schematic flowchart of a rotor manufacturing method according to an embodiment of this application.

[0096] in, Figures 1 to 9 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0097] 10 Rotor, 100 Rotor core, 110 Second groove, 112 Bottom of the second groove, 114 Opening of the second groove, 120 Mounting hole, 200 Retainer, 200a First retainer, 200b Second retainer, 210 First groove, 220 Connecting section, 222 First wall, 224 Second wall, 230 Connecting section, 300 Mounting slot, 310 Opening, 400 Permanent magnet, 500 Fixing sleeve, 510 Protrusion, 20 Press, 30 Fixing sleeve base material. Detailed Implementation

[0098] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0099] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0100] The following reference Figures 1 to 10 Rotor 10, motor, steering system and vehicle according to some embodiments of this application.

[0101] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, a rotor 10 according to some embodiments of this application includes a rotor core 100, a plurality of retainers 200, a plurality of permanent magnets 400 and a fixing sleeve 500.

[0102] Multiple retaining elements 200 are provided on the outer periphery of the rotor core 100.

[0103] Furthermore, multiple retaining members 200 are arranged at intervals along the circumference of the rotor 10.

[0104] An installation groove 300 with an opening 310 is formed between two adjacent retainers 200 and rotor core 100.

[0105] The opening 310 is positioned opposite to the outer peripheral wall of the rotor core 100.

[0106] At least a portion of the retainers 200 have a first groove 210 on their radial outer surface.

[0107] Each permanent magnet 400 is located in a mounting slot 300.

[0108] Furthermore, a portion of the permanent magnet 400 protrudes from the mounting groove 300 through the opening 310.

[0109] The retaining sleeve 500 is fitted onto the outside of the multiple retaining members 200.

[0110] The fixing sleeve 500 is provided with a plurality of protrusions 510, the number of protrusions 510 being less than or equal to the number of first grooves 210, and each protrusion 510 being embedded in a first groove 210.

[0111] The portion of the permanent magnet 400 protruding from the mounting groove 300 is fitted against the inner peripheral wall of the fixing sleeve 500.

[0112] The rotor 10 provided in this application includes a rotor core 100, multiple retainers 200, multiple permanent magnets 400, and a fixing sleeve 500.

[0113] Any one of the multiple retainers 200 is disposed on the outer periphery of the rotor core 100. Adjacent retainers 200 and the rotor core 100 enclose a mounting groove 300 with an opening 310; that is, the multiple retainers 200 and the rotor core 100 enclose multiple mounting grooves 300. Each mounting groove 300 is provided with a permanent magnet 400, and a portion of the permanent magnet 400 protrudes from the mounting groove 300 through the opening 310. The shape of the permanent magnet 400 matches the shape of the mounting groove 300.

[0114] At least a portion of the retainers 200 have a first groove 210 on their radial outer surface; that is, each retainer 200 has a first groove 210 on its radial outer surface. Alternatively, a portion of the retainers 200 have a first groove 210 on their radial outer surface.

[0115] After assembling multiple retaining members 200 and multiple permanent magnets 400 onto the outer periphery of the rotor core 100, a fixing sleeve base material 30 is fitted onto the outer side of the multiple retaining members 200. A press 20 is used to press the fixing sleeve base material 30 along the direction from the outer peripheral wall to the inner peripheral wall, causing a portion of the fixing sleeve base material 30 to be pressed into the first groove 210 to form a protrusion 510. It can be understood that the portion of the fixing sleeve base material 30 located within the first groove 210 is the protrusion 510, and the protrusion 510 and the first groove 210 are fitted together. During the pressing process, the portion of the fixing sleeve 500 located between two adjacent first grooves 210 shrinks, causing the fixing sleeve 500 to press tightly against the outer side of the multiple permanent magnets 400, so that the portion of the permanent magnets 400 protruding from the mounting groove 300 is fitted against the inner peripheral wall of the fixing sleeve 500.

[0116] The fixing sleeve 500, multiple retaining members 200, and rotor core 100 cooperate to fasten and limit multiple permanent magnets 400 in the circumferential and radial directions of the rotor 10, so that the permanent magnets 400 are securely assembled onto the rotor core 100. This avoids the possibility of multiple permanent magnets 400 becoming loose due to assembly errors, ensures the assembly dimensions of the permanent magnets 400 and rotor core 100, effectively increases the reliability of the motor, and suppresses motor noise.

[0117] Furthermore, the protrusion 510 of the retaining sleeve 500 is embedded in the first groove 210 of the retaining member 200. The cooperation between the protrusion 510 and the first groove 210 can prevent the retaining sleeve 500 from moving in the circumferential direction of the rotor 10, thereby further suppressing motor noise. This further enhances the product's performance and market competitiveness.

[0118] The fixing sleeve 500 has multiple protrusions 510, the number of which is less than or equal to the number of first grooves 210, and each protrusion 510 is embedded in one first groove 210. For example... Figure 8 and Figure 9 As shown, when the number of protrusions 510 is less than the number of first grooves 210, a portion of the first grooves 210 are equipped with protrusions 510, while another portion of the first grooves 210 are not equipped with protrusions 510. That is to say, not every first groove 210 is equipped with a protrusion 510.

[0119] Optionally, when each retainer 200 has a first groove 210 on its radial outer surface, and the number of protrusions 510 is less than the number of first grooves 210, since each retainer 200 is provided with a first groove 210, the assembly difficulty of the rotor core 100 and the multiple retainers 200 is simplified, and it is not necessary to mark the assembly position of the retainers 200 with the first grooves 210. This arrangement, while ensuring the assembly dimensions of the multiple permanent magnets 400 and the rotor core 100, helps to reduce the assembly difficulty of the rotor 10, improves the assembly efficiency of the rotor 10, and reduces the production cost of the product.

[0120] In some embodiments, optionally, such as Figure 1 As shown, the radial outer surface of the retainer 200 is spaced apart from the inner peripheral wall of the fixing sleeve 500.

[0121] In this embodiment, the mating structure of the retainer 200 and the fixing sleeve 500 is further defined.

[0122] Specifically, the radial outer surface of the retainer 200 is spaced apart from the inner peripheral wall of the fixing sleeve 500. That is, along the radial direction of the rotor 10, there is a gap between the retainer 200 and the inner peripheral wall of the fixing sleeve 500, and the radial outer surface of the retainer 200 and the inner peripheral wall of the fixing sleeve 500 are not fitted together.

[0123] This arrangement ensures the effectiveness of multiple retainers 200 in fixing the permanent magnet 400 between the retainer 200 and the rotor core 100, while also reducing the machining accuracy requirements of the retainers 200 and the permanent magnets 400, thus guaranteeing the reliability of the rotor 10 assembly. If the radial outer surface of the retainer 200 is fitted to the inner peripheral wall of the fixing sleeve 500, the machining accuracy requirement for the retainer 200 is higher. This is because if the distance from the radial outer surface of the retainer 200 to the rotor core 100 is greater than the distance from the radial outer surface of the permanent magnet 400 to the rotor core 100, the inner peripheral wall of the fixing sleeve 500 cannot effectively fit against the outer peripheral wall of the permanent magnet 400, thus failing to achieve the purpose of pressing the multiple permanent magnets 400 together, resulting in the permanent magnets 400 becoming loose.

[0124] It is understandable that the radial outer surface of the retainer 200 is spaced apart from the inner peripheral wall of the fixed sleeve 500, that is, the distance from the radial outer surface of the retainer 200 to the rotor core 100 is less than the distance from the inner peripheral wall of the fixed sleeve 500 to the rotor core 100.

[0125] like Figure 1 As shown, the rotor core 100 has a mounting hole 120. The distance from the outer peripheral wall of the permanent magnet 400 to the center of the mounting hole 120 is denoted as R1, the distance from the outer peripheral wall of the retainer 200 to the center of the mounting hole 120 is denoted as R2, and the distance from the inner peripheral wall of the fixing sleeve base 30 to the center of the mounting hole 120 is denoted as R3. <R1<R3。

[0126] The distance from the inner circumferential wall of the fixing sleeve 500 to the center of the mounting hole 120 is denoted as R4, where R2 <R4。

[0127] In some embodiments, optionally, such as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the plurality of retainers 200 includes a plurality of first retainers 200a and a plurality of second retainers 200b.

[0128] The first retainer 200a is provided with a first groove 210.

[0129] At least one second retainer 200b is provided between two adjacent first retainers 200a.

[0130] In this embodiment, the multiple retainers 200 are classified into multiple types, including multiple first retainers 200a and multiple second retainers 200b. The first retainer 200a is provided with a first groove 210, and the second retainer 200b is not provided with a first groove 210.

[0131] At least one second retainer 200b is provided between two adjacent first retainers 200a, that is, two adjacent first retainers 200a are arranged at intervals through at least one second retainer 200b.

[0132] This configuration can not only ensure the effective positioning of the fixed sleeve 500 and multiple retainers 200, but also reduce the pressing area of ​​the fixed sleeve substrate 30, reduce the processing steps of multiple retainers 200, improve the processing efficiency of the fixed sleeve 500, and help reduce the processing cost of the rotor 10.

[0133] In addition, this configuration allows the fixed sleeve 500 to be effectively pressed into the first groove 210 of the first retainer 200a at different positions, ensuring the balance and consistency of the force at different positions of the fixed sleeve 500, and effectively limiting the fixed sleeve 500 in the circumferential direction of the rotor 10.

[0134] Optionally, the number of second retainers 200b provided between any two adjacent first retainers 200a may include two, three, four, etc., which will not be listed here.

[0135] In some embodiments, optionally, such as Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, multiple first grooves 210 are arranged at equal intervals along the circumference of the rotor 10.

[0136] In this embodiment, the distribution structure of the plurality of retainers 200 is further defined.

[0137] Along the circumference of the rotor 10, multiple first grooves 210 are arranged at equal intervals. This arrangement can ensure the balance and consistency of the force at different positions of the fixing sleeve 500, and can effectively limit the fixing sleeve 500 in the circumference of the rotor 10.

[0138] It is understood that a receiving groove is formed between two adjacent first retainers 200a and rotor core 100, that is, multiple first retainers 200a and rotor core 100 form multiple receiving grooves, and the same number of second retainers 200b are provided in any two adjacent receiving grooves.

[0139] In some other embodiments, a portion of the plurality of first grooves 210 are arranged at equal intervals.

[0140] In some embodiments, optionally, such as Figure 2 As shown, the retainer 200 includes a connecting section 220 and a connecting section 230.

[0141] The connecting section 220 has a first wall 222 and a second wall 224 that are arranged opposite to each other in the radial direction of the rotor 10.

[0142] The first wall 222 is located between the rotor core 100 and the second wall 224.

[0143] The first wall surface 222 is set to fit the radial outer surface of two adjacent permanent magnets 400.

[0144] The connecting section 230 to the connecting section 220 extend toward the rotor core 100.

[0145] The connecting section 230 is sandwiched between two adjacent permanent magnets 400.

[0146] The rotor core 100 is provided with a second groove 110.

[0147] The end of the connecting section 230 is inserted into the second groove 110.

[0148] In this embodiment, the structure of the retainer 200 is further defined.

[0149] The retainer 200 includes a connecting section 220 and a connecting section 230. The connecting section 230 extends toward the rotor core 100 from the connecting section 220. The end of the connecting section 230 opposite to the connecting section 220 is inserted into the second groove 110.

[0150] Along the radial direction of the rotor 10, the retainer 200 includes a first wall surface 222 and a second wall surface 224, which are disposed opposite to each other. The first wall surface 222 is located between the rotor core 100 and the second wall surface 224.

[0151] An mounting groove 300 is formed between the first wall surface 222 of two adjacent retainers 200, the connecting section 230 and the rotor core 100, and an opening 310 is formed between the second wall surface 224 of two adjacent retainers 200.

[0152] The first wall surface 222 is set to fit the radial outer surface of two adjacent permanent magnets 400. The connecting section 230 is sandwiched between two adjacent permanent magnets 400. The connecting section 220, the rotor core 100 and the connecting section 230 cooperate to limit the permanent magnets 400 in the circumferential and radial directions of the rotor 10, so as to ensure the matching dimensions of multiple permanent magnets 400 and rotor core 100.

[0153] It is understandable that the sidewalls of the first wall 222 and the connecting section 230 extend in different directions. The sidewalls of the first wall 222 and the connecting section 230 are slots that engage with the outer surface of the permanent magnet 400, so as to effectively limit the permanent magnet 400 between the rotor core 100 and the retainer 200.

[0154] Optionally, the connecting segment 230 is connected to the middle of the connecting segment 220.

[0155] Optionally, the portion between the middle of the connecting segment 220 and its edge is connected to the connecting segment 230.

[0156] In some embodiments, the shape of the end of the connecting segment 230 is optionally the same as the shape of the second groove 110.

[0157] The cross-sectional area of ​​the bottom 112 of the second groove is greater than the cross-sectional area of ​​the area enclosed by the opening 114 of the second groove.

[0158] In this embodiment, the mating structure of the connecting section 230 and the rotor core 100 is further defined.

[0159] The rotor core 100 is provided with a second groove 110, and the end of the connecting section 230 is inserted into the second groove 110. The shape of the end of the connecting section 230 is the same as the shape of the second groove 110.

[0160] In this design, the cross-sectional area of ​​the bottom 112 of the second groove is larger than the cross-sectional area of ​​the area enclosed by the opening 114 of the second groove. That is, the second groove 110 has a groove-shaped structure with a small opening and a large bottom. When the end of the connecting section 230 is inserted into the second groove 110, it can be effectively limited along the radial limiting retainer 200 of the rotor core 100 and along the circumferential limiting retainer 200 of the rotor core 100, so that the permanent magnet 400 is effectively limited and the displacement of the permanent magnet 400 relative to the rotor core 100 is prevented.

[0161] Optionally, the second groove 110 extends through the rotor core 100 along the axial direction of the rotor 10. This arrangement enables the retainer 200 and the rotor core 100 to be effectively assembled, offering advantages in ease of operation and improving assembly efficiency and feasibility.

[0162] In some embodiments, the first groove 210 and the connecting segment 230 are optionally disposed opposite to each other.

[0163] In this embodiment, the structure of the retainer 200 is further defined such that the first groove 210 and the connecting segment 230 are disposed opposite to each other, that is, the first groove 210 is located in the middle of the connecting segment 220. This arrangement can ensure the thickness of the portion of the retainer 200 at the first groove 210, and can ensure the effectiveness and feasibility of the retainer 200 in limiting the permanent magnet 400.

[0164] If the first groove 210 is located on one side of the connecting section 230 along the circumference of the rotor 10, then the thickness of the retainer 200 at the first groove 210 is relatively thin, and the retainer 200 is easily deformed. This will weaken the external force acting on the permanent magnet 400, and the permanent magnet 400 is prone to loosening, which will increase the operating noise of the motor.

[0165] In some embodiments, the number of protrusions 510 may be denoted as M, where 2 ≤ M ≤ 10, and M is an even number.

[0166] In this embodiment, the number of protrusions 510 is further limited, such that the number of protrusions 510 is denoted as M, where 2≤M≤10, and M is an even number. For example, the number of protrusions 510 includes 4, 6, and 8.

[0167] This design ensures the mating area and angle between the fixed sleeve 500 and the multiple retaining members 200. The fixed sleeve 500 can press the multiple retaining members 200 from multiple directions and angles, ensuring the balance and consistency of the force on the multiple permanent magnets 400. It provides reliable structural support for ensuring the mating dimensions of the multiple permanent magnets 400 and the rotor core 100.

[0168] Furthermore, this design also takes into account the processing difficulty of multiple retainers 200, simplifies the processing steps of multiple retainers 200, and helps to reduce the production cost of multiple retainers 200.

[0169] In some embodiments, the retaining sleeve 500 may optionally be a non-magnetic metal sleeve.

[0170] In this embodiment, the structure of the fixing sleeve 500 is further defined such that the fixing sleeve 500 is a non-magnetic metal sleeve, the fixing sleeve 500 is a metal material that will not cause significant magnetization under the action of a magnetic field, and the magnetic permeability of the fixing sleeve 500 is low, so it will not affect the operating parameters of the motor.

[0171] Optionally, the retaining sleeve 500 includes a stainless steel sleeve, an aluminum alloy sleeve, and a titanium alloy sleeve.

[0172] In some embodiments, the thickness of the fixing sleeve 500 may be greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0173] In this embodiment, the structure of the fixing sleeve 500 is further defined such that the thickness of the fixing sleeve 500 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. This configuration ensures the effectiveness and feasibility of fixing the multiple permanent magnets 400 and the rotor core 100 while also ensuring the overall external dimensions of the rotor 10 and the overall dimensions of the motor.

[0174] Optionally, the thickness of the fixing sleeve 500 includes 0.2mm, 0.3mm and 0.4mm, etc., which will not be listed here.

[0175] An electric motor according to some embodiments of this application includes: a rotor 10 as in any of the above embodiments.

[0176] The motor provided in this application includes the rotor 10 as described in the above embodiments, and therefore has all the beneficial effects of the rotor 10, which will not be described in detail here.

[0177] A steering system according to some embodiments of this application includes: a motor as described in the above embodiments.

[0178] The steering system provided in this application includes a rotor as described in the above embodiments, or a motor as described in the above embodiments. Therefore, it has all the beneficial effects of the rotor or motor described above, which will not be described one by one here.

[0179] A vehicle according to some embodiments of this application includes: a motor or steering system as described in the above embodiments.

[0180] The vehicle provided in this application includes a motor as described in the above embodiments, or a steering system as described in the above embodiments. Therefore, it has all the beneficial effects of the motor or steering system described above, which will not be described in detail here.

[0181] It is worth noting that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0182] The vehicles can also be gasoline-powered cars and hybrid cars.

[0183] Optionally, this application provides a rotor 10, a motor, a steering system, a vehicle, and a method for manufacturing the rotor 10. A plurality of permanent magnets 400 are arranged circumferentially around the rotor core 100, with the radially inner surface of the permanent magnets 400 contacting the outer peripheral wall of the rotor core 100. A retainer 200 holds the permanent magnets 400 between the retainer and the rotor core 100. The radially outer surface of the retainer 200 has a first groove 210 extending axially along the rotor 10. A steel sleeve (i.e., a fixing sleeve 500) is fitted around the outer periphery of the permanent magnets 400. A portion of the steel sleeve is pressed into the first groove 210 of the retainer 200 by a press 20, which can more reliably fix the permanent magnets 400 to the rotor core 100, preventing the permanent magnets 400 from wobbling due to manufacturing errors, and restricting the circumferential movement of the steel sleeve.

[0184] Optionally, a rotor 10 includes: a rotating shaft; a rotor core 100 fixed to the outer peripheral surface of the rotating shaft; a plurality of permanent magnets 400 arranged circumferentially along the rotor core 100 and fixed to the outer peripheral surface of the rotor core 100; a retainer 200 for holding the permanent magnets 400 between the retainer and the rotor core 100, the retainer 200 being a resin material and having a first groove 210 on its radially outer surface; and a steel sleeve fitted onto the outer peripheral surface of the permanent magnets 400 of the rotor 10, the steel sleeve having a protrusion 510 protruding radially inward, the protrusion 510 engaging with the first groove 210 of the retainer 200.

[0185] Optionally, the radius corresponding to the radial outer surface of the permanent magnet 400 is denoted as R1, the radius of the inner surface of the fixing sleeve substrate 30 is denoted as R3, and the radius corresponding to the radial outer surface of the retainer 200 is denoted as R2, wherein R2 < R1 < R3.

[0186] Optionally, the number of protrusions 510 is M, where 2 ≤ M ≤ 10, and M is an even number.

[0187] Optionally, the cross-sectional shape of the opening of the first groove 210 includes circular and square shapes.

[0188] Optionally, the steel sleeve is a non-magnetic metal component.

[0189] Optionally, the wall thickness of the steel sleeve is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0190] The motor (i.e., electric motor) includes a rotor 10 and a cylindrical stator facing the outer periphery of the rotor 10.

[0191] Optionally, the manufacturing method of the rotor 10 includes: fixing a plurality of retaining members 200 and a plurality of permanent magnets to the outer peripheral surface of the rotor core 100 in a manner arranged along the circumference of the rotor 10; fitting a fixing sleeve substrate 30 on the radially outer side of the plurality of permanent magnets; and then using a press 20 to press the fixing sleeve substrate 30 from the radially outer side to the radially inner side to press out a protrusion 510, the protrusion 510 fitting into the first groove 210 of the retaining member 200.

[0192] Optionally, the fixed sleeve substrate 30 has a gap with the permanent magnet 400 in the radial direction of the rotor 10.

[0193] Optionally, the fixing sleeve 500 is provided with protrusions 510, and the number of protrusions 510 is M.

[0194] Optionally, if M=2, then the press 20 simultaneously presses in the two protrusions 510.

[0195] Optionally, if 2 < M, multiple protrusions 510 need to be pressed in sequentially in (M / 2) batches.

[0196] Optionally, when the mechanism presses the protrusion 510 into the steel sleeve in stages, the mechanism of the previous pressing step needs to be held in place and not released.

[0197] In this application, the fixing sleeve substrate 30 has a gap with the permanent magnet 400, and the fixing sleeve substrate 30 has a gap with the retainer 200. This arrangement allows for convenient assembly of the fixing sleeve substrate 30.

[0198] In this application, a press 20 presses the steel sleeve from its radially outer side to its radially inner side, pressing the steel sleeve to create a protrusion 510. The protrusion 510 fits into the first groove 210 of the retainer 200. This process shrinks the steel sleeve, thus securing the permanent magnet 400 and preventing it from loosening due to manufacturing errors. This design increases the reliability of the motor and suppresses motor noise.

[0199] This application provides a method for manufacturing a rotor, used to prepare the rotor as described in the above embodiments, such as... Figure 10 As shown, the method for manufacturing this rotor includes:

[0200] Step 802: Place multiple permanent magnets and multiple retaining elements along the circumference of the rotor core on the outer periphery.

[0201] Step 804: A fixing sleeve base material is fitted onto the outer periphery of the multiple retainers;

[0202] Step 806: Use a press to squeeze the base material of the fixing sleeve to form a fixing sleeve, so that the protrusion is embedded in the first groove and the part of the permanent magnet protruding from the mounting groove is in contact with the inner peripheral wall of the fixing sleeve.

[0203] This application specifies the detailed steps of the rotor preparation method.

[0204] Multiple permanent magnets and multiple retainers are placed circumferentially on the outer periphery of the rotor core. The retainers are spaced apart circumferentially, with adjacent retainers and the rotor core forming an open mounting slot; that is, the multiple retainers and the rotor core enclose multiple mounting slots. Each mounting slot contains one permanent magnet, a portion of which protrudes from the slot through an opening. The shape of the permanent magnet matches the shape of the mounting slot.

[0205] At least a portion of the retainers have a first groove on their outer peripheral walls.

[0206] After assembling multiple retaining members and multiple permanent magnets onto the outer periphery of the rotor core, a fixing sleeve substrate is fitted onto the outside of the retaining members. A press is then used to press the fixing sleeve substrate along its outer to inner periphery, causing a portion of the fixing sleeve substrate to be embedded into a first groove to form a protrusion. It can be understood that the portion of the fixing sleeve substrate located within the first groove is the protrusion, and the protrusion and the first groove are fitted together. During the pressing process, the portion of the fixing sleeve located between two adjacent first grooves shrinks, thus pressing the fixing sleeve tightly against the outside of the multiple permanent magnets.

[0207] The fixing sleeve, multiple retaining parts, and rotor core work together to secure and limit multiple permanent magnets in the circumferential and radial directions of the rotor, ensuring that the permanent magnets are firmly assembled onto the rotor core. This prevents the permanent magnets from becoming loose due to assembly errors, guarantees the assembly dimensions of the permanent magnets and rotor core, effectively increases the reliability of the motor, and suppresses motor noise.

[0208] Furthermore, the protrusion of the retaining sleeve is embedded in the first groove of the retaining member. The cooperation between the protrusion and the first groove prevents the retaining sleeve from moving circumferentially on the rotor, thus further suppressing motor noise. This further enhances the product's performance and market competitiveness.

[0209] In some embodiments, the step of using a press to extrude the fixing sleeve substrate to form the fixing sleeve may specifically include: when the number of protrusions is equal to 2, using a press to extrude the fixing sleeve substrate so that a portion of the fixing sleeve substrate is simultaneously embedded in two first grooves; when the number of protrusions is greater than 2, using a press to extrude the fixing sleeve substrate in stages so that a portion of the fixing sleeve substrate is embedded in multiple first grooves in stages.

[0210] In this embodiment, the step of forming the retaining sleeve by pressing the retaining sleeve substrate with a press is further defined.

[0211] Determine the number of the first grooves.

[0212] When the number of protrusions is equal to 2, the fixing sleeve substrate is pressed by a press so that a part of the fixing sleeve substrate is simultaneously embedded in two first grooves, that is, two protrusions are simultaneously pressed and formed, and each protrusion is embedded in a first groove.

[0213] When the number of protrusions is greater than 2, the fixing sleeve substrate is pressed in stages by a press so that a part of the fixing sleeve substrate is simultaneously embedded in multiple first grooves. That is, multiple protrusions are simultaneously pressed and formed (the number of protrusions is greater than 2), and each protrusion is embedded in a first groove.

[0214] When the number of protrusions is greater than 2, the fixing sleeve substrate is pressed in stages using a press machine so that a portion of the fixing sleeve substrate is embedded into multiple first grooves in stages. That is, multiple protrusions are formed by pressing in batches (the number of protrusions is greater than 2), and each protrusion is embedded into a first groove.

[0215] For example, when there are 4 protrusions, the fixing sleeve substrate is pressed twice by a press so that a part of the fixing sleeve substrate is embedded into the 4 first grooves in stages. That is, the first pressing forms two protrusions and the second pressing forms two protrusions.

[0216] For example, when there are 6 protrusions, the fixing sleeve substrate is pressed three times by a press so that a part of the fixing sleeve substrate is embedded into the 6 first grooves in stages. That is, the first pressing forms two protrusions, the second pressing forms two protrusions, and the third pressing forms two protrusions.

[0217] During the process of pressing the substrate of the fixed sleeve in stages, the mechanism of the preceding pressing press needs to be held in place and cannot be released. This is to ensure the matching dimensions of the multiple protrusions formed by pressing.

[0218] In some embodiments, optionally, the permanent magnet and the retainer have a gap between themselves and the inner peripheral wall of the retaining sleeve substrate along the radial direction of the rotor.

[0219] In this embodiment, the mating relationship between the permanent magnet, the retainer, and the fixing sleeve substrate is further defined.

[0220] Along the radial direction of the rotor, there is a gap between the permanent magnet and the retainer and the inner peripheral wall of the fixed sleeve substrate. That is, along the radial direction of the rotor, there is a gap between the permanent magnet and the inner peripheral wall of the fixed sleeve substrate, and there is a gap between the retainer and the inner peripheral wall of the fixed sleeve substrate.

[0221] This design allows the fixing sleeve substrate to be quickly fitted onto the outer periphery of multiple retainers, reducing the resistance between the retainer and the permanent magnet and the fixing sleeve substrate. This helps to reduce the processing accuracy requirements of the retainer and the permanent magnet and the fixing sleeve substrate, improves the assembly efficiency of the retainer and the permanent magnet and the fixing sleeve substrate, and thus reduces the production cost of the retainer and the permanent magnet and the fixing sleeve substrate.

[0222] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0223] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotor, characterized in that, include: Rotor core; Multiple retainers are disposed on the outer peripheral side of the rotor core, and the multiple retainers are arranged at intervals along the circumference of the rotor. An open mounting groove is formed between two adjacent retainers and the rotor core. The opening is disposed opposite to the outer peripheral wall of the rotor core. At least a portion of the multiple retainers have a first groove on their radial outer surface. Multiple permanent magnets, each of the permanent magnets being disposed in one of the mounting slots, and a portion of the permanent magnet protruding from the mounting slot through the opening; A fixing sleeve is fitted onto the outside of the plurality of retaining members. The fixing sleeve has a plurality of protrusions, the number of which is less than or equal to the number of the first grooves. Each protrusion is embedded in one of the first grooves. The portion of the permanent magnet protruding from the mounting groove is fitted against the inner peripheral wall of the fixing sleeve.

2. The rotor according to claim 1, characterized in that, The radial outer surface of the retainer is spaced apart from the inner peripheral wall of the fixing sleeve.

3. The rotor according to claim 1 or 2, characterized in that, The plurality of retaining members include a plurality of first retaining members and a plurality of second retaining members, wherein the first retaining members are provided with the first groove, and at least one second retaining member is disposed between two adjacent first retaining members.

4. The rotor according to claim 1 or 2, characterized in that, The number of protrusions is denoted as M, where 2 ≤ M ≤ 10, and M is an even number.

5. The rotor according to claim 1 or 2, characterized in that, The fixing sleeve is a non-magnetic metal sleeve.

6. The rotor according to claim 1 or 2, characterized in that, The thickness of the fixing sleeve is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

7. The rotor according to claim 1 or 2, characterized in that, The retaining element includes: The connecting section has a first wall and a second wall that are disposed opposite to each other in the radial direction of the rotor. The first wall is located between the rotor core and the second wall and is disposed in contact with the radial outer surface of two adjacent permanent magnets. The connecting section extends toward the rotor core and is sandwiched between two adjacent permanent magnets. The rotor core has a second groove, and the end of the connecting section is inserted into the second groove.

8. The rotor according to claim 7, characterized in that, The shape of the end of the connecting segment is the same as the shape of the second groove, and the cross-sectional area of ​​the bottom of the second groove is greater than the cross-sectional area of ​​the area enclosed by the opening of the second groove. Wherein, along the axial direction of the rotor, the second groove penetrates the rotor core.

9. The rotor according to claim 7, characterized in that, The first groove and the connecting segment are arranged opposite to each other.

10. An electric motor, characterized in that, include: The rotor as described in any one of claims 1 to 9.

11. A steering system, characterized in that, include: The rotor as described in any one of claims 1 to 9; or The motor as described in claim 10.

12. A vehicle, characterized in that, include: The motor as described in claim 10; or The steering system as described in claim 11.

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