Rotor balance structure, rotor, motor and vehicle

Abstract

The utility model relates to a rotor balance structure, a rotor, a motor and a vehicle, the rotor balance structure comprises a balance disc used for being installed on the end portion of a rotor iron core, the balance disc comprises an annular disc body, the disc surface of the disc body is provided with a plurality of first open holes used for being embedded with counterweight parts, the disc surface of the disc body is further provided with a protruding structure, and the protruding structure is arranged on the disc surface of the disc body. The protruding structures are used for weight reduction and / or secondary weight increment. When the rotor is subjected to dynamic balance, the counterweight piece can be embedded in the open hole firstly, so that primary weight gain dynamic balance is realized. Due to the fact that the protruding structures can be used for weight reduction and secondary weight increment, the weight of the rotor can be reduced after the rotor is subjected to primary weight increment, a more precise dynamic balance process is achieved, and operation is flexible. In addition, in addition to weight reduction, secondary weight increment can be carried out, the mode can be matched with the primary weight increment dynamic balance to offset larger unbalance amount, the mode can also be used as a weight increment mode of secondary dynamic balance, and the flexibility is high.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a rotor balancing structure, a rotor, a motor, and a vehicle. Background Technology

[0002] Under complex operating conditions such as high speed, high temperature, and vibration, traditional dynamic balancing correction processes are insufficient to meet the production demands for low cost and high efficiency in new energy vehicle motors. In related technologies, the rotor dynamic balancing calibration employs a weight-removal method, which involves drilling holes in the balancing end plates on both sides of the rotor to remove weight. However, this method is difficult to implement in practice. On the one hand, it is difficult to control the weight removed from the balancing end plates, easily leading to their scrapping; on the other hand, the dynamic balancing adjustment method is limited and cannot meet the requirements of high-precision dynamic balancing. Therefore, this traditional rotor dynamic balancing correction process can no longer meet current production needs. Utility Model Content

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

[0004] According to a first aspect of the present disclosure, a rotor balancing structure is provided, including a balancing disk for mounting to an end of a rotor core. The balancing disk includes an annular disk body, and the disk body has a plurality of first openings on its surface for embedding counterweights.

[0005] The disk surface of the disk body is also provided with a raised structure, which is used for weight reduction and / or secondary weight increase.

[0006] Optionally, the protrusion structure is configured as an annular boss concentric with the disk body, and the annular boss may be disconnected and / or may be provided with a second opening for the weight reduction.

[0007] Optionally, the second opening can be used to embed a counterweight for the secondary weight increase.

[0008] Optionally, the first opening is located on the side of the protruding structure away from the center of the disk body.

[0009] Optionally, the density of the protrusion structure is less than the density of the counterweight.

[0010] Optionally, a plurality of the first openings are arranged along a circular trajectory, the circular trajectory being concentric with the disk body.

[0011] Optionally, the number of balance discs is two, and the two balance discs are respectively installed at both ends of the rotor core. The rotor balancing structure also includes a plurality of connecting rods connected between the two balance discs, and the plurality of connecting rods are used to pass through the rotor core axially.

[0012] Optionally, the two balance discs and the plurality of connecting rods are integrally injection molded.

[0013] According to a second aspect of the present disclosure, a rotor is provided, comprising:

[0014] Rotor core;

[0015] Magnets are embedded in the rotor core;

[0016] The rotor shaft extends axially through the rotor core; and

[0017] The rotor balancing structure described above.

[0018] Optionally, the rotor shaft passes through the inner hole of the disk body and has a reserved gap with the inner circumferential surface of the disk body.

[0019] Optionally, the second outer surface of the rotor core is formed with a plurality of mounting slots, the magnets are embedded in the mounting slots, and the mounting slots have radially outward openings to expose the magnets from the openings of the mounting slots.

[0020] Optionally, in the radial direction, the outer peripheral surface of the disk body is closer to the central axis of the rotor than the first outer surface of the magnet that is away from the central axis of the rotor.

[0021] According to a third aspect of the present disclosure, an electric motor is provided, including the rotor described above.

[0022] According to a fourth aspect of the present disclosure, a vehicle is provided, including the motor described above.

[0023] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: When performing dynamic balancing on the rotor, a primary weight-adding dynamic balancing (coarse dynamic balancing) can be achieved by first embedding counterweights (such as steel balls) in the openings. Since the protruding structure can be used for weight reduction and secondary weight addition, after the primary weight addition is completed on the rotor, weight reduction can also be performed to achieve a more precise dynamic balancing process, making the operation flexible. In addition, besides weight reduction, secondary weight addition can also be performed. This method can exist in conjunction with the aforementioned primary weight-adding dynamic balancing to offset a larger imbalance, or it can be used as a weight addition method for secondary dynamic balancing, offering high flexibility. That is, the rotor balancing structure can use multiple methods to dynamically balance the rotor, providing more operational space for the rotor dynamic balancing process, achieving higher dynamic balancing standards and accuracy, improving the fault tolerance rate of dynamic balancing, and reducing the rotor scrap rate.

[0024] 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram of a rotor balancing structure exemplarily shown according to this disclosure;

[0027] Figure 2 This is a schematic diagram of a rotor exemplarily shown according to this disclosure;

[0028] Figure 3 yes Figure 2 The exploded view of the rotor is shown in the image.

[0029] Figure 4 yes Figure 2 The axial view of the rotor is shown in the image.

[0030] Figure 5 yes Figure 2 The image shows a cross-sectional view of the rotor perpendicular to the axial direction.

[0031] Explanation of reference numerals in the attached figures

[0032] 1-Rotor core; 101-Weight reduction hole; 102-Second outer surface; 103-Mounting groove; 2-Disc body; 201-First opening; 202-Inner circumferential surface; 203-Outer circumferential surface; 3-Rotor shaft; 4-Protruding structure; 401-Circular boss; 402-Second opening; 5-Connecting rod; 6-Magnet; 601-First outer surface; 7-Reserved gap. Detailed Implementation

[0033] 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.

[0034] Reference Figures 1-5This disclosure exemplarily illustrates a rotor balancing structure, including a balancing disc for mounting to the end of a rotor core 1, where "end" refers to the axial end of the rotor core 1. The balancing disc can be integrally injection molded to the end of the rotor core 1, or it can be molded and then mounted to the end of the rotor core 1. The balancing disc includes an annular disc body 2, the surface of which is provided with a plurality of first openings 201 for embedding counterweights. The disc body 2 also has a protruding structure 4 on its surface, which is used for weight reduction and secondary weight increase, or can be used for either weight reduction or secondary weight increase. This disclosure does not limit how weight reduction and secondary weight increase are achieved; for example, both can be achieved by partially removing material from the protruding structure 4. Here, "partial material removal" can refer to processes such as cutting or milling to achieve the aforementioned weight reduction. Alternatively, it can refer to making additional holes (such as the second opening mentioned below) in the protruding structure 4 for embedding corresponding counterweights for secondary weight increase.

[0035] In the embodiments of this disclosure, the counterweight can be a steel ball or the like. The protrusion structure 4 can be a circular boss as mentioned below, or it can also be a square boss, a plurality of scattered protrusions, etc., as long as it can be partially removed for dynamic balancing. The protrusion structure 4 can be located on the side (inner side) of the plurality of first openings 201 near the rotor central axis, or it can be located on the side (outer side) of the plurality of first openings 201 away from the rotor central axis. Alternatively, when it includes a plurality of scattered protrusions, some of the protrusions can be located on the inner side of the plurality of first openings 201, and some can be located on the outer side of the plurality of first openings 201.

[0036] By using the above technical solution, when performing dynamic balancing on the rotor, a weight-added dynamic balancing (coarse dynamic balancing) can be achieved first by embedding counterweights (such as steel balls) in the first opening 201. Since the protruding structure 4 can be used for weight reduction and secondary weight addition, after the rotor has undergone primary weight addition, weight reduction can be performed to achieve a more precise dynamic balancing process, offering operational flexibility. Furthermore, in addition to weight reduction, secondary weight addition can also be performed. This method can be used in conjunction with the aforementioned primary weight-added dynamic balancing to offset larger imbalances, or it can be used as a secondary weight-added method for dynamic balancing, offering high flexibility. In other words, this rotor balancing structure can employ multiple methods to dynamically balance the rotor, providing more operational space for the rotor dynamic balancing process, achieving higher dynamic balancing standards and precision, improving the fault tolerance rate of dynamic balancing, and reducing the rotor scrap rate.

[0037] As stated above, this disclosure does not limit the protrusion structure 4, for example in Figures 1-4In the illustrated embodiment, the protrusion structure 4 can be constructed as a concentric annular boss 401 with the disk body 2, meaning that the inner or outer contour of the annular boss 401 is concentric with the disk body 2. The annular boss 401 can be located on the side of the plurality of first openings 201 near the rotor central axis, or it can be located on the side of the plurality of first openings 201 away from the rotor central axis. The annular boss 401 can be disconnected or can be provided with a second opening 402 for the aforementioned weight reduction. Alternatively, the annular boss 401 can be disconnected and can be provided with a second opening 402 for the aforementioned weight reduction. With this design, on the one hand, the annular boss 401, which forms a concentric circular structure with the disk body 2, is more conducive to the dynamic balance of the rotor, avoiding the influence of the protrusion structure 4 itself on the dynamic balance. On the other hand, constructing the protrusion structure 4 as the aforementioned annular boss 401 makes it easier to disconnect it at any position and provide a second opening 402 (for material removal and weight reduction), providing more options for dynamic balance adjustment and making it easier to calculate the material removal position and amount. The aforementioned disconnection refers to removing material at any position on the annular boss 401 to form a notch.

[0038] In the embodiments of this disclosure, the second opening 402 can be used not only for weight reduction but also for embedding a counterweight for secondary weight increase. The counterweight can also be a steel ball or the like.

[0039] Reference Figures 1-4 In the embodiments of this disclosure, the first opening 201 can be located on the side of the protruding structure 4 away from the center of the disk body 2. For example, when multiple first openings 201 are arranged along a circular trajectory, the protruding structure 4 is located in the inner circle of the circular trajectory formed by the multiple first openings 201. During the dynamic balancing process, when adjusting the same mass, the dynamic balancing effect is stronger the further away from the center of the balance disk. Therefore, by arranging the first opening 201 at a position far from the center, when performing a coarse weight-increasing dynamic balancing through the first opening 201, the dynamic balancing adjustment range is larger and the adjustment capability is stronger when the mass of the counterweight is constant. Similarly, arranging the protruding structure 4 closer to the center allows for a more precise effect when adjusting its weight-reducing dynamic balancing.

[0040] In the embodiments of this disclosure, the density of the protrusion structure 4 can be less than the density of the counterweight. Specifically, the density of the protrusion structure 4 can be 1 / 4 to 1 / 6 of that of the counterweight, specifically 1 / 4, 1 / 5, 1 / 6, etc. This design, using a low-density material for the protrusion structure 4, allows for a more precise dynamic balancing process when removing material to reduce weight (resulting in less weight reduction for the same volume).

[0041] Specifically, in the embodiments of this disclosure, the counterweight can be a steel ball, and the protruding structure 4 can be made of plastic.

[0042] This disclosure does not limit how the protrusion structure 4 is formed on the disk body 2. For example, in the embodiments of this disclosure, the protrusion structure 4 and the disk body 2 can be integrally injection molded, for example, both of which are plastic parts. Alternatively, the protrusion structure 4 and the disk body 2 can be manufactured separately and then assembled into one piece.

[0043] Reference Figures 1-5 In the embodiments disclosed herein, a plurality of first openings 201 may be arranged along a circular trajectory, which may be concentric with the disk body 2. That is, the line connecting the centers of the plurality of first openings 201 is a circle, and this circle is concentric with the inner or outer contour of the disk body 2.

[0044] Reference Figure 1 In the embodiments of this disclosure, there can be two balancing discs, which are respectively installed at both ends of the rotor core 1. The rotor balancing structure may also include multiple connecting rods 5 connected between the two balancing discs. The multiple connecting rods 5 are used to pass through the rotor core 1 axially, specifically through the weight reduction holes 101 of the rotor core 1, thereby fixing the rotor balancing structure to the rotor core 1. Connecting the rotor balancing structure to the rotor core 1 via connecting rods 5, compared to the traditional method of completely covering it from the side, is beneficial for exposing the rotor magnets 6, which can effectively reduce magnetic leakage and improve the overall efficiency of the motor. Furthermore, the design of two balancing discs allows for selective dynamic balancing adjustment of the two discs during dynamic balancing, providing greater operational flexibility.

[0045] In the embodiments of this disclosure, the two balancing discs and the multiple connecting rods 5 can be integrally injection molded. When used in a rotor, weight-reducing holes 101 can be first opened in the rotor core 1, and then the rotor balancing structure can be integrally molded into the rotor core 1 through injection molding, reducing complex assembly processes and improving the connection reliability between the connecting rods 5 and the disc body 2.

[0046] According to a second aspect of this disclosure, a rotor is provided, comprising a rotor core 1, a magnet 6 embedded in the rotor core 1, a rotor shaft 3 extending axially through the rotor core 1, and the aforementioned rotor balancing structure. Since the rotor has all the beneficial effects of the aforementioned rotor balancing structure, further details are omitted here.

[0047] Reference Figures 1-4In some embodiments, the rotor shaft 3 can pass through the inner hole of the disk body 2 and has a reserved gap 7 between it and the inner circumferential surface 202 of the disk body 2. Here, "inner hole" refers to the through hole formed by the inner contour of the disk body 2. "Reserved gap" refers to the gap between the outer contour of the rotor shaft 3 and the inner circumferential surface 202 of the disk body 2. This design has the advantages of facilitating mold opening and sealing during injection molding. Specifically, before injection molding, the mold needs to be sealed to prevent glue overflow, and the reserved gap 7 can provide operating space for sealing. In addition, if the reserved gap 7 is not present when the mold is opened after injection molding, the balance disk may stick to the rotor shaft 3, or even overflow glue between the rotor shaft 3 and the rotor core 1. Moreover, a reasonable reserved gap 7 can avoid contact between the mold movement and the rotor shaft 3 before and after injection molding, preventing deformation of the injection workpiece or wear of the mold due to the lack of a reserved gap 7.

[0048] Reference Figure 4 In the embodiments of this disclosure, the second outer surface 102 of the rotor core 1 can be formed with a plurality of mounting grooves 103, and the magnet 6 can be embedded in the mounting groove 103. The mounting groove 103 has a radially outward opening along the circumferential cross section of the rotor core 1, so that a portion of the magnet 6 can be exposed from the opening of the mounting groove 103, for example, directly exposed to the air (low magnetic permeability), which can effectively reduce magnetic leakage and improve the overall efficiency of the motor.

[0049] This disclosure does not limit the formation of the mounting groove 103. For example, in some embodiments, it can be directly recessed into the second outer surface 102 of the rotor core 1. Alternatively, in some embodiments, the rotor core 1 may include multiple segments, and two adjacent segments form a mounting groove 103 with an outward opening (i.e., the aforementioned opening extending radially outward along the circumferential cross-section of the rotor core 1) through their own structure. During installation, the magnet 6 can be embedded into the mounting groove 103 to achieve the installation of the magnet 6 and the rotor core 1.

[0050] Reference Figure 4 In the embodiments of this disclosure, radially, the outer peripheral surface 203 of the disk body 2 is closer to the rotor's central axis than the first outer surface 601 of the magnet 6, which is farther from the rotor's central axis. That is, the outer peripheral surface 203 of the disk body 2 is located inside the first outer surface 601 of the magnet 6. This design avoids the mold extending radially outwards to the outside of the first outer surface 601 of the magnet 6 during injection molding, thus preventing the problem of injection molding overflow on the outside of the first outer surface 601.

[0051] Specifically, in the embodiments of this disclosure, the radial distance between the outer peripheral surface 203 and the first outer surface 601 can be 1mm-5mm. The purpose of setting an upper limit for this distance is to prevent the outer diameter of the injection-molded balance disc from being too small, which would lead to a decrease in the dynamic balance adjustment function. The purpose of setting a lower limit is to reserve sufficient mold installation space and error range, preventing the mold from being unable to be installed or the problem of glue overflow on the outside due to excessively small distance.

[0052] According to a third aspect of this disclosure, an electric motor is provided, comprising the rotor described above, the advantages of which will not be elaborated here.

[0053] According to a fourth aspect of this disclosure, a vehicle is provided that includes the aforementioned motor, since the vehicle has all the beneficial effects of the aforementioned motor, which will not be repeated here.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.”

[0061] 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.”

[0062] 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.

[0063] 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.

Claims

1. A rotor balancing structure comprising a balancing disc for mounting to an end portion of a rotor core, characterized by, The balance disc comprises a disc body in the shape of a ring, a disc surface of the disc body is provided with a plurality of first openings for embedding counterweights, The disc surface of the disc body is further provided with a raised structure for weight reduction and / or secondary weight increase.

2. The rotor balancing structure according to claim 1, characterized by, The raised structure is configured as a ring-shaped boss concentric with the disc body, and the ring-shaped boss is breakable and / or provided with second openings for the weight reduction.

3. The rotor balancing structure according to claim 2, characterized by The second openings are used for embedding counterweights for the secondary weight increase.

4. The rotor balancing structure according to claim 1, characterized by, The first openings are located on a side of the raised structure away from a center of the disc body.

5. The rotor balancing structure according to claim 1, characterized by, The density of the raised structure is less than the density of the counterweights.

6. The rotor balancing structure according to claim 1, characterized by The first openings are arranged along a circular track concentric with the disc body.

7. The rotor balancing structure according to any one of claims 1 to 6, characterized in that, The number of the balance discs is two, and the two balance discs are used for being respectively mounted to two ends of the rotor core.

8. The rotor balancing structure according to claim 7, characterized by The rotor balancing structure further comprises a plurality of connecting rods connected between the two balance discs, and the plurality of connecting rods are used for penetrating the rotor core in the axial direction.

9. A rotor characterized by, The two balance discs and the plurality of connecting rods are integrally injection molded. Comprise: a rotor core; magnetic steel embedded in the rotor core; a rotor shaft penetrating the rotor core in the axial direction; and the rotor balancing structure according to any one of claims 1-8.

10. The rotor of claim 9, wherein The rotor shaft has a reserved gap between the inner hole of the disc body and the inner circumferential surface of the disc body.

11. The rotor of claim 9, wherein The second outer surface of the rotor core is formed with a plurality of mounting grooves, the magnetic steel is embedded in the mounting grooves, and the mounting grooves have openings outward in the radial direction so that the magnetic steel is exposed from the openings of the mounting grooves.

12. The rotor of claim 11, wherein In the radial direction, the outer circumferential surface of the disc body is closer to the central axis of the rotor than the first outer surface of the magnetic steel away from the central axis of the rotor.

13. An electric machine characterized by Comprise the rotor according to any one of claims 9-12.

14. A vehicle characterized by comprising: Comprise the motor according to claim 13.

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