Rotor assembly, motor and vehicle

Abstract

The utility model relates to a rotor assembly, a motor and a vehicle, the rotor assembly comprises a rotating shaft, a rotor iron core and a locking piece, the rotating shaft is provided with a plurality of positioning grooves, the rotor iron core comprises a plurality of rotor iron core splicing blocks which are sequentially spliced along the circumferential direction of the rotating shaft, the interior of the rotating shaft is hollow, the locking piece is arranged in a cavity of the rotating shaft, each rotor iron core splicing block is provided with an insertion part, the insertion part can be inserted into the corresponding positioning groove, and every two adjacent rotor iron core splicing blocks are matched with each other and are fixed in the radial direction through a locking piece. The rotor iron core splicing blocks are matched with the positioning grooves in the rotating shaft through the insertion parts, every two adjacent rotor iron core splicing blocks are matched and provided with the locking pieces, the locking pieces are arranged in the cavities of the rotating shaft and can play a stopping role in the radial direction, radial locking is achieved, the multiple rotor iron core splicing blocks can be stably connected to the rotating shaft, and the rotating shaft is stably connected with the rotor iron core splicing blocks. The reliability of connection between the rotor iron core blocks and the rotating shaft is ensured, and the overall strength of the rotor assembly is improved.

Description

Technical Field

[0001] This disclosure relates to the field of electric motor technology, and more particularly to a rotor assembly, an electric motor, and a vehicle. Background Technology

[0002] The rotor assembly includes a rotor core, a shaft, magnets, and a balance disc. In related technologies, the rotor core is mounted on the shaft and rotates with the shaft. As the rotational speed increases, the rotor core and the shaft are prone to loosening, affecting the overall connection strength of the rotor assembly and thus the performance of the motor. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a rotor assembly, an electric motor, and a vehicle.

[0004] According to a first aspect of the present disclosure, a rotor assembly is provided, comprising:

[0005] A rotating shaft, on which multiple positioning grooves are provided;

[0006] A rotor core, the rotor core comprising a plurality of rotor core blocks sequentially assembled circumferentially along the axis of rotation; and

[0007] A locking element is provided within the cavity of the rotating shaft, which is hollow inside.

[0008] Each rotor core assembly has an insertion part that can be inserted into the corresponding positioning slot. Two adjacent rotor core assemblies cooperate with each other and are radially fixed by the locking member.

[0009] Optionally, the rotating shaft is provided with a first positioning groove group and at least two second positioning groove groups. The first positioning groove group and the second positioning groove group each include a plurality of positioning grooves arranged at intervals along the circumferential direction. At least a portion of the positioning grooves in the first positioning groove group and the second positioning groove group are staggered along the axial direction.

[0010] The plurality of rotor core blocks include a first core block and a second core block arranged alternately in a circumferential direction. The first insertion part of the first core block is inserted into the first positioning slot of the first positioning slot group, and the second insertion part of the second core block is inserted into the second positioning slot of the second positioning slot group.

[0011] The locking member cooperates with the first insertion part and can fix the first iron core block and the second iron core block.

[0012] Optionally, the rotor core assembly includes a main body having a first arc surface for engaging with the rotating shaft, and an insertion portion disposed on the first arc surface and extending axially, wherein the insertion portion is one or more.

[0013] Optionally, the first insertion portion has a stop section located at the end and locking grooves provided on two sides of the first insertion portion and extending axially.

[0014] The locking member comprises two sections joined together axially, the locking member being located within the locking groove and radially limited by the stop section.

[0015] Optionally, the rotor core assembly has a main body and crimping portions on two sides of the main body, so that when two adjacent rotor core assemblies are assembled, the crimping portion of one can overlap the crimping portion of the other.

[0016] Optionally, the main body of the first iron core block is provided with a first pressing part on both sides. In the radial direction close to the insertion part, the first pressing part has multiple first bosses with gradually decreasing circumferential width, and the multiple first bosses form a first stepped surface.

[0017] Optionally, the main body of the second core block is provided with a second pressing part on both sides. In the radial direction close to the insertion part, the second pressing part has multiple second protrusions with gradually increasing circumferential width. The multiple second protrusions form a second step surface, and the first step surface abuts against the second step surface.

[0018] Optionally, the rotor assembly further includes a magnetic component disposed between two adjacent rotor core blocks. One of the two adjacent rotor core blocks has a first protrusion and a second protrusion on two sides of its main body. A groove for accommodating the magnetic component is formed between the first protrusion and the second protrusion, and the magnetic component is fixed in the groove.

[0019] Optionally, the rotor assembly further includes a balance disc, the balance disc having two disc bodies located at both ends of the rotor core and a plurality of first connecting rods connected between the two disc bodies, the rotor core assembly having a through hole extending axially, and the first connecting rods being located within the through hole.

[0020] Optionally, the rotor core assembly has weight-reducing grooves on two sides of its main body, and the balance disc also includes multiple second connecting rods connected between the two disc bodies, with the second connecting rods located within the weight-reducing grooves.

[0021] Optionally, the cross-section of the rotor core assembly is triangular.

[0022] According to a second aspect of the present disclosure, an electric motor is provided, including the rotor assembly described above.

[0023] According to a third aspect of the present disclosure, a vehicle is provided, including the motor provided in the present disclosure.

[0024] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: In the rotor assembly provided by this disclosure, the rotor core is spliced ​​circumferentially. During assembly, magnetic components can be pre-fixed on the rotor core assemblies and clamped between two adjacent rotor core assemblies, avoiding wear on the rotor core caused by axial insertion of the magnetic components. In addition, the rotor core assemblies cooperate with the positioning groove on the shaft through the insertion part. Two adjacent rotor core assemblies cooperate and are provided with locking components. The locking components are located in the cavity of the shaft and can play a stop role in the radial direction, realizing radial locking. By optimizing the connection method between multiple rotor core assemblies and the connection method between rotor core assemblies and shaft, multiple rotor core assemblies can be stably connected to the shaft, ensuring the reliability of the connection between rotor core assemblies and shaft, thereby improving the overall strength of the rotor assembly.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0027] Figure 1 This is a schematic diagram of the structure of a rotor assembly according to an exemplary embodiment.

[0028] Figures 2 to 4 This is an exploded view of a rotor assembly according to an exemplary embodiment.

[0029] Figure 5 This is a schematic diagram of a partial structure of a rotor assembly according to an exemplary embodiment, showing a first core assembly and a magnetic component.

[0030] Figure 6 This is a schematic diagram of a partial structure of a rotor assembly according to an exemplary embodiment, showing a first core assembly, a magnetic element, and a locking element.

[0031] Figure 7 and Figure 8 This is a schematic diagram of a partial structure of a rotor assembly according to an exemplary embodiment, showing a first core assembly, a second core assembly, and a magnetic element.

[0032] Figure 9This is a schematic diagram of the structure of the first iron core assembly according to an exemplary embodiment.

[0033] Figure 10 This is a schematic diagram of the structure of a second iron core assembly according to an exemplary embodiment.

[0034] Figure 11 This is a schematic diagram of the structure of the shaft in a rotor assembly according to an exemplary embodiment.

[0035] Figure 12 This is a schematic diagram illustrating the stamping arrangement of rotor core blocks according to an exemplary embodiment.

[0036] Explanation of reference numerals in the attached figures

[0037] 1-Rotor core; 11-Rotor core assembly; 101-First core assembly; 102-Second core assembly; 1011-First insertion part; 1021-Second insertion part; 110-Main body; 1100-First arc surface; 111-Insertion part; 1111-Stop section; 1112-Locking groove; 112-Crimping part; 1121-First crimping part; 11210-First stepped surface; 11211-First boss; 1122-Second crimping part; 11220-Second stepped surface; 11221 - Second boss; 113 - Protrusion; 1130 - Groove; 1131 - First protrusion; 1132 - Second protrusion; 114 - Weight reduction groove; 115 - Through hole; 2 - Rotating shaft; 21 - Positioning groove; 201 - First positioning groove group; 2011 - First positioning groove; 202 - Second positioning groove group; 2021 - Second positioning groove; 3 - Magnetic component; 4 - Locking component; 5 - Balance disc; 51 - Disc body; 52 - Connecting rod; 521 - First connecting rod; 522 - Second connecting rod. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0039] In this disclosure, unless otherwise stated, directional terms such as "axial," "circumferential," and "radial" generally refer to the axis of rotation of the motor provided in this disclosure, and "inner" and "outer" may refer to the inner and outer contours of the corresponding component or its location within or outside its environment, depending on the specific context. Furthermore, when the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or material significance.

[0040] In this disclosure, such as Figures 1 to 10 As shown, a rotor assembly is provided, which includes a rotor core 1, a rotating shaft 2, and a locking member 4. The rotating shaft 2 is provided with a plurality of positioning grooves 21. The rotor core 1 includes a plurality of rotor core blocks 11 sequentially spliced ​​along the circumference of the rotating shaft 2. The rotating shaft 2 is hollow inside. The locking member 4 is provided in the cavity of the rotating shaft 2. Each rotor core block 11 has an insertion part 111, which can be inserted into the corresponding positioning groove 21. Two adjacent rotor core blocks 11 cooperate with each other and are radially fixed by the locking member 4.

[0041] It should be noted that this disclosure includes embodiments in which multiple rotor core modules 11 are designed with the same structure, and each rotor core module 11 is equipped with a separate locking element 4. This disclosure also includes embodiments in which multiple rotor core modules 11 are designed with different structures, for example including... Figure 9 and Figure 10 The two embodiments of rotor core assembly 11 shown are described, in which, as in the embodiment, Figure 6 and Figure 7 As shown, the first iron core block 101 and the second iron core block 102 are press-fitted together. Only the first iron core block 101 needs to be provided with a corresponding locking member 4, so that the first iron core block 101 and the second iron core block 102 can be fixed at the same time. Both are within the protection scope of this disclosure. The latter will be used as an example for detailed description below.

[0042] Furthermore, the insertion part 111 and the positioning groove 21 can cooperate in various ways. Figure 9 In the illustrated embodiment, radial limiting can be achieved by the stop section 1111 at the end of the insertion part 111, or by providing a separate locking member 4 (see reference) after the insertion part 111 is inserted into the positioning groove 21. Figure 6 (As shown) radial fixation can be achieved. Of course, radial fixation of the rotor core block 11 can also be achieved by stamping the end of the insertion part 111 or by designing the structure of the stop section 1111, and both are within the protection scope of this disclosure.

[0043] In the rotor assembly provided in this disclosure, the rotor core 1 is spliced ​​circumferentially. During assembly, the magnetic component 3 can be pre-fixed on the rotor core assembly 11 and clamped between two adjacent rotor core assemblies 11 to prevent the magnetic component 3 from axially inserting and causing wear to the rotor core 1. In addition, each rotor core assembly 11 cooperates with the positioning groove 21 on the rotating shaft 2 through the insertion part 111. Two adjacent rotor core assemblies 11 cooperate and are provided with a locking component 4. The locking component 4 is located in the cavity of the rotating shaft 2 and can play a stop role in the radial direction to achieve radial and firm locking. By optimizing the connection method between multiple rotor core assemblies 11 and the connection method between rotor core assemblies 11 and rotating shaft 2, multiple rotor core assemblies 11 can be stably connected to the rotating shaft 2, ensuring the reliability of the connection between rotor core assemblies 11 and rotating shaft 2, thereby improving the overall strength of the rotor assembly.

[0044] In this disclosure, such as Figure 4 and Figure 11 As shown, the rotating shaft 2 is provided with a first positioning groove group 201 and at least two second positioning groove groups 202. The first positioning groove group 201 and the second positioning groove group 202 each include a plurality of positioning grooves 21 arranged at intervals along the circumference. At least a portion of the positioning grooves 21 of the first positioning groove group 201 and the second positioning groove group 202 are staggered along the axial direction. The plurality of rotor core blocks 11 include a first core block 101 and a second core block 102 arranged alternately along the circumference. The first insertion part 1011 of the first core block 101 is inserted into the first positioning groove 2011 of the first positioning groove group 201, and the second insertion part 1021 of the second core block 102 is inserted into the second positioning groove 2021 of the second positioning groove group 202. The locking member 4 cooperates with the first insertion part 1011 and can fix the first core block 101 and the second core block 102.

[0045] For example, such as Figure 4 As shown, the first positioning groove group 201 can be located between the two second positioning groove groups 202, that is, the positioning grooves 21 of the first positioning groove group 201 and the second positioning groove group 202 are completely offset in the axial direction. The first insertion part 1011 of the first iron core block 101 is used to insert and cooperate with the first positioning groove 2011 of the first positioning groove group 201. Correspondingly, as Figure 9As shown, in the first core assembly 101, the first insertion part 1011 can be located at the middle position of the main body 110 in the axial direction. The second insertion part 1021 of the second core assembly 102 is used to engage with the second positioning groove 2021 of the second positioning groove group 202. Accordingly, in the second core assembly 102, there are at least two second insertion parts 1021, which can be arranged near both ends of the main body 110. In this way, the first core assembly 101 and the second core assembly 102 will not interfere with or affect each other when connected to the rotating shaft 2, while ensuring that both can be stably connected to the rotating shaft 2.

[0046] In other embodiments, the positioning grooves 21 of the first positioning groove group 201 and the second positioning groove group 202 are at least partially staggered in the axial direction. That is, the projections of the first positioning groove 2011 of the first positioning groove group 201 and the second positioning groove 2021 of the second positioning groove group 202 in the axial direction overlap, which can also realize the connection between multiple rotor core blocks 11 and the rotating shaft 2.

[0047] In the above embodiments, the rotor core 1 includes two types of rotor core modules 11. Multiple first core modules 101 have identical structures, and the first insertion portions 1011 of the multiple first core modules 101 are positioned identically in the axial direction. Multiple second core modules 102 have identical structures, and the second insertion portions 1021 of the multiple second core modules 102 are positioned identically in the axial direction. Of course, this disclosure also includes embodiments where the positions of the multiple first insertion portions 1011 and the multiple second insertion portions 1021 differ in the axial direction. In this embodiment, the multiple first positioning grooves 2011 and the multiple second positioning grooves 2021 can be at least partially staggered along the axial direction. The axial lengths of the first insertion portions 1011 and the second insertion portions 1021, as well as the number of second insertion portions 1021, can be designed as needed. The lengths of the two second insertion portions 1021 and the first insertion portions 1011 can cover the axial direction of the rotor core module 11, ensuring reliable connection.

[0048] This disclosure provides two different rotor core modules 11, such as... Figures 7 to 10As shown, the difference between the two lies in the different structures of the first insertion part 1011 of the first core assembly 101 and the second insertion part 1021 of the second core assembly 102, as well as the different structures of the pressing parts 112 on both sides of the main body 110, which will be described below. The design concept of this disclosure is based on simplifying the structure of the second core assembly 102, achieving pre-positioning of the second core assembly 102 on the rotating shaft 2, restricting the radial movement of the second core assembly 102 by the first core assembly 101, and finally restricting the radial movement of the first core assembly 101 by the locking member 4, thereby achieving radial fixation of the first core assembly 101 and the second core assembly 102, thus forming a stable rotor core 1. Of course, this disclosure also includes designs where the first core assembly 101 and the second core assembly 102 are designed with the same structure, for example, both designed as… Figure 9 The structures shown are examples of those fixed by locking members 4.

[0049] For example, such as Figure 9 and Figure 10 As shown, the rotor core assembly 11 includes a main body 110, which has a first arc surface 1100 for fitting with the rotating shaft 2, and an insertion part 111 is provided on the first arc surface 1100 and extends axially.

[0050] like Figure 11 As shown, the shaft 2 has a hollow interior design. The insertion part 111, after being inserted into the positioning groove 21, is located within the inner cavity of the shaft 2. This inner cavity also provides operating space for the subsequently assembled locking member 4 and can serve as a heat dissipation channel for the cooling medium flowing through the shaft 2. When assembling multiple rotor core modules 11 sequentially, the first arc surface 1100 is ensured to fit against the outer surface of the shaft 2, thereby ensuring that the multiple rotor core modules 11 are installed in place. The insertion part 111 can be any suitable structure protruding from the first arc surface 1100, for example… Figure 10 The elongated shape shown in the figure, by designing the axial length of the insertion part 111, can ensure the connection strength between the rotor core block 11 and the rotating shaft 2.

[0051] like Figure 9 As shown, in the first core assembly 101, the first insertion portion 1011 has a stop section 1111 located at the end and locking grooves 1112 provided on two sides of the first insertion portion 1011 and extending axially. The locking member 4 can be two halves joined together axially. The locking member 4 is located in the locking groove 1112 and is radially limited by the stop section 1111. After the first insertion portion 1011 of the first core assembly 101 is inserted into the first positioning groove 2011, the two halves of the locking member 4 are inserted axially opposite each other into the inner cavity of the rotating shaft 2, which can radially limit the first insertion portion 1011 and further improve the connection strength between the first core assembly 101 and the rotating shaft 2. Figure 10The insertion part 111 and the positioning groove 21 shown cooperate to achieve the positioning of the second iron core block 102. Figure 9 The insertion part 111 described herein can prevent the first iron core block 101 from moving radially by means of the locking groove 1112 and the positioning groove 21 and the limiting function of the stop section 1111.

[0052] In order to achieve a radial pressing fit between the first core assembly 101 and the second core assembly 102, in this disclosure, as follows: Figure 7 and Figure 8 As shown, the rotor core assembly 11 has crimping portions 112 on two sides of the main body 110. When two adjacent rotor core assemblies 11 are joined, the crimping portion 112 of one can overlap the crimping portion 112 of the other. In an exemplary embodiment, this can be achieved by adjusting the radial positions of the first crimping portion 1121 on the first core assembly 101 and the second crimping portion 1122 on the second core assembly 102. For example, relative to the second crimping portion 1122, the first crimping portion 1121 is further away from the insertion portion 111. When the first core assembly 101 and the second core assembly 102 are joined, the first crimping portion 1121 presses above the second crimping portion 1122, thereby preventing the second core assembly 102 from moving radially.

[0053] In the embodiments provided in this disclosure, the first crimping portion 1121 and the second crimping portion 1122 are positioned in the same radial direction, and their structures are designed accordingly. For example... Figure 7 and Figure 8 As shown, in the first iron core block 101, the main body 110 has a first pressing part 1121 on both sides. In the radial direction close to the insertion part 111, the first pressing part 1121 has multiple first bosses 11211 with gradually decreasing circumferential width, and the multiple first bosses 11211 form a first stepped surface 11210.

[0054] In the second core assembly 102, the main body 110 has a second pressing part 1122 on each side. In the radial direction close to the insertion part 111, the second pressing part 1122 has multiple second bosses 11221 with gradually increasing circumferential width. The multiple second bosses 11221 form a second step surface 11220. The first step surface 11210 abuts against the second step surface 11220.

[0055] The overlapping and engagement of the first step surface 11210 and the second step surface 11220 enables the first core block 101 to press against the second core block 102. This disclosure does not limit the number of first protrusions 11211 in the first pressing part 1121 or the number of second protrusions 11221 in the second pressing part 1122; they can be protruding two-tiered protrusions or three-tiered protrusions, etc.

[0056] For example, in the second core assembly 102, such as Figure 10 As shown, protrusions 113 are provided on the two sides of the main body 110, and a weight-reducing groove 114 is provided between the protrusions 113 and the pressing part 112.

[0057] The weight reduction groove 114 can realize the lightweight design of the rotor core 1. At the same time, when the balance disk 5 is integrally injection molded, the balance disk 5 can have a second connecting rod 522 located in the weight reduction groove 114, which increases the connection strength of the balance disk 5 to multiple rotor core blocks 11 and ensures the structural strength of the entire rotor assembly.

[0058] For example, in the first core assembly 101, such as Figure 9 As shown, the main body 110 has a first protrusion 1131 and a second protrusion 1132 on its two sides. A groove 1130 for accommodating a magnetic component is formed between the first protrusion 1131 and the second protrusion 1132. The second protrusion 1132 is positioned radially relative to... Figure 10 The central protrusion 113 is in the same radial position.

[0059] like Figure 5 As shown, the magnetic component 3 can be fixed in the groove 1130, for example, it can be glued to the groove 1130. The magnetic component 3 is pre-installed on the first iron core block 101, and there is no need to insert it radially later, so as to avoid scratching the rotor iron core and ensure the performance of the motor.

[0060] like Figure 12 As shown, the cross-section of the rotor core assembly 11 provided in this disclosure is approximately triangular, for example, similar to an isosceles triangle. When the triangle is stamped and arranged, the two hypotenuses of the triangle are arranged in parallel, and the bases of two adjacent triangles are arranged in parallel, which can be closely arranged, resulting in less waste after stamping, improving material utilization and reducing costs.

[0061] like Figure 4 As shown, the rotor assembly provided in this disclosure also includes a balance disc 5. The balance disc 5 has two disc bodies 51 located at both ends of the rotor core 1 and a plurality of connecting rods 52 connected between the two disc bodies 51. The connecting rods 52 include a first connecting rod 521 and a second connecting rod 522 described above, as follows: Figure 9 and Figure 10 As shown, the rotor core assembly 11 has a through hole 115 extending along the axial direction. The first connecting rod 521 is located in the through hole 115, which can not only connect the two disk bodies 51, but also connect multiple rotor core assemblies 11, ensuring the integrity and structural strength of the rotor assembly.

[0062] When assembling the rotor assembly provided in this disclosure, the two second insertion portions 1021 of the second core assembly 102 can be inserted into the corresponding second positioning slots 2021 first. After inserting the two second core assemblies 102, as follows: Figure 3 A space is left between two adjacent second iron core blocks 102; the main body 110 of the first iron core block 101 has grooves 1130 on both sides, which can be used to pre-attach and fix the two magnetic parts 3 into the corresponding grooves 1130 to form Figure 5 The structure shown is followed by inserting the first insertion part 1011 of the first iron core block 101 with magnetic component 3 into the corresponding first positioning groove 2011, which completely seals the space. The second iron core block 102 is then radially pressed together by the first iron core block 101. Finally, the locking component 4 is inserted axially into the inner cavity of the rotating shaft 2 to achieve radial locking of the first iron core block 101. Afterwards, the integrally injection-molded balance disc 5 connects the multiple rotor iron core blocks 11 together, completing the assembly of the rotor assembly.

[0063] According to a second aspect of this disclosure, an electric motor is provided, which includes the rotor assembly described above. This electric motor possesses all the beneficial effects of the aforementioned rotor assembly, which will not be elaborated upon here.

[0064] According to a third aspect of this disclosure, a vehicle is provided, including the motor provided herein. This vehicle possesses all the beneficial effects of the motor provided herein, which will not be elaborated upon here.

[0065] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0066] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0067] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0068] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0069] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0070] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0071] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0072] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0073] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A rotor assembly characterized by, include: A rotating shaft, on which multiple positioning grooves are provided; The rotor core comprises a plurality of rotor core blocks that are sequentially spliced ​​together circumferentially along the axis of rotation; as well as A locking element is provided within the cavity of the rotating shaft, which is hollow inside. Each rotor core assembly has an insertion part that can be inserted into the corresponding positioning slot. Two adjacent rotor core assemblies cooperate with each other and are radially fixed by the locking member.

2. The rotor assembly of claim 1, wherein The rotating shaft is provided with a first positioning groove group and at least two second positioning groove groups. The first positioning groove group and the second positioning groove group each include a plurality of positioning grooves arranged at intervals along the circumferential direction. At least a portion of the positioning grooves in the first positioning groove group and the second positioning groove group are staggered along the axial direction. The plurality of rotor core blocks include a first core block and a second core block arranged alternately in a circumferential direction. The first insertion part of the first core block is inserted into the first positioning slot of the first positioning slot group, and the second insertion part of the second core block is inserted into the second positioning slot of the second positioning slot group. The locking member cooperates with the first insertion part and can fix the first iron core block and the second iron core block.

3. The rotor assembly of claim 1, wherein The rotor core assembly includes a main body, which has a first arc surface for fitting with the rotating shaft, and the insertion part is disposed on the first arc surface and extends axially.

4. The rotor assembly of claim 2, wherein The first insertion part has a stop section located at the end and locking grooves provided on two sides of the first insertion part and extending axially; The locking member comprises two sections joined together axially, the locking member being located within the locking groove and radially limited by the stop section.

5. The rotor assembly of claim 2, wherein The rotor core assembly has a main body and crimping portions on two sides of the main body. When two adjacent rotor core assemblies are assembled, the crimping portion of one can overlap the crimping portion of the other.

6. The rotor assembly of claim 5, wherein The main body of the first iron core block is provided with a first pressing part on both sides. In the radial direction close to the insertion part, the first pressing part has multiple first protrusions with gradually decreasing circumferential width, and the multiple first protrusions form a first stepped surface.

7. The rotor assembly of claim 6, wherein The main body of the second core block is provided with a second pressing part on both sides. In the radial direction close to the insertion part, the second pressing part has multiple second protrusions with gradually increasing circumferential width. The multiple second protrusions form a second step surface, and the first step surface abuts against the second step surface.

8. The rotor assembly of claim 1, wherein The rotor assembly also includes a magnetic component disposed between two adjacent rotor core blocks. One of the two adjacent rotor core blocks has a first protrusion and a second protrusion on two sides of its main body. A groove for accommodating the magnetic component is formed between the first protrusion and the second protrusion, and the magnetic component is fixed in the groove.

9. The rotor assembly according to claim 1, characterized in that, The rotor assembly also includes a balance disc, which has two disc bodies located at both ends of the rotor core and a plurality of first connecting rods connected between the two disc bodies. The rotor core assembly has a through hole extending axially, and the first connecting rods are located in the through hole.

10. The rotor assembly of claim 9, wherein, The rotor core assembly has weight-reducing grooves on two sides of its main body. The balance disc also includes multiple second connecting rods connected between the two disc bodies, and the second connecting rods are located in the weight-reducing grooves.

11. The rotor assembly of any one of claims 1-10, wherein, The rotor core assembly has a triangular cross-section.

12. An electric machine characterized by Includes the rotor assembly according to any one of claims 1-11.

13. A vehicle characterized by comprising: Includes the motor as described in claim 12.

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