Motor rotor and motor
By designing a guide bar and end ring connection with a transition part with a large cross-sectional area in the motor rotor, the problem of stress concentration at the connection between the guide bar and the end ring is solved, and the service life of the motor is extended.
Patent Information
- Application Number
- CN202310833251.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-07
- Publication Date
- 2025-01-07
AI Technical Summary
There is stress concentration at the connection between the guide bar and the end ring in the motor rotor, which causes material deformation and damage, shortening the service life of the motor.
Design a motor rotor, whose rotor laminate assembly is provided with a plurality of guide bar through holes in the axial direction, and a transition portion of the guide bar and the end ring is formed through a casting process to ensure that the cross-sectional area of the transition portion is greater than the middle portion of the guide bar. Reduce stress concentration.
By reducing stress concentration, the connection strength and durability of the motor rotor are improved and the service life of the motor is extended.
Smart Images
Figure CN119276031A_ABST
Abstract
Description
Technical Field
[0001] This application relates to an electric motor rotor and an electric motor. Background Technology
[0002] An electric motor consists of a rotor and a stator, such as... Figures 1 to 3 As shown, the motor rotor may include a rotor lamination assembly 1, guide bars 2, and end rings 3. The end rings 3 are connected to both ends of the guide bars 2, and the guide bars 2 pass through the rotor lamination assembly 1. According to strength test simulations, there is a stress concentration phenomenon at the connection between the guide bars 2 and the end rings 3. The material around the stress concentration point is prone to reaching its yield limit, which may lead to material deformation and damage, resulting in a shorter service life of the motor. Summary of the Invention
[0003] This application aims to provide a motor rotor that avoids or reduces stress concentration at the connection between the guide bars and the end rings, thereby improving the rotor's lifespan. This application also proposes a motor including a motor rotor.
[0004] This application provides an embodiment of an electric motor rotor, comprising:
[0005] A rotor lamination assembly, wherein the rotor lamination assembly is cylindrical, and the rotor lamination assembly is provided with a plurality of guide bar through holes, the plurality of guide bar through holes extending along the axial direction of the rotor lamination assembly and arranged along the circumferential direction of the rotor lamination assembly;
[0006] Multiple guide bars, the guide bars passing through the guide bar through holes; and
[0007] An end ring is connected to both ends of the guide bar, and the cross-sectional area of the transition portion connecting the guide bar and the end ring is larger than the cross-sectional area of the main body portion in the middle of the guide bar.
[0008] In at least one possible implementation, the transition portion connecting the guide bar and the end ring is located inside the through hole of the guide bar.
[0009] In at least one possible implementation, the rotor lamination assembly includes at least two sizes of rotor lamination groups, with different cross-sectional areas of the guide bar through holes in the different sizes of the rotor lamination groups.
[0010] In at least one possible implementation, the rotor lamination assembly includes a first lamination group, two second lamination groups, and two third lamination groups.
[0011] Along the axial direction of the motor rotor, the first lamination group is located inside the two second lamination groups, and the two third lamination groups are respectively located outside the two second lamination groups.
[0012] The circumferential dimension of the guide bar through hole in the first stack is smaller than that in the second stack, and the circumferential dimension of the guide bar through hole in the second stack is smaller than that in the third stack.
[0013] In at least one possible implementation, the guide bar and the end ring are integrally formed by a casting process.
[0014] In at least one possible implementation, the circumferential and / or radial dimensions of the guide bar through holes of the rotor lamination assembly are made larger at both ends of the axial direction than the circumferential and / or radial dimensions of the middle portion by machining.
[0015] In at least one possible implementation, the cross-sectional area of the guide bar increases towards the outermost axial ends, and the cross-sectional area of the guide bar changes smoothly without step-like variations.
[0016] In at least one possible implementation, the guide bar through-hole is a strip-shaped hole extending radially along the rotor lamination assembly.
[0017] The cross-section of the guide bar does not have a sharp-angled structure.
[0018] In at least one possible implementation, the guide bar and the end ring are made of aluminum or copper.
[0019] The embodiments of this application also propose an electric motor, including the motor rotor described in any of the above technical solutions.
[0020] By adopting the above technical solution, the cross-sectional area of the transition part between the guide bar and the end ring is made larger, the stress concentration is lower, or in other words, the transition part can withstand greater force, the risk of surface material deformation or damage is reduced, and the service life of the motor is extended. Attached Figure Description
[0021] Figure 1 A schematic diagram of a possible rotor lamination assembly for an electric motor is shown.
[0022] Figure 2 A schematic diagram of a possible motor's guide bar and end ring structure is shown.
[0023] Figure 3 It shows Figure 1 and Figure 2 A partial structural diagram of the motor.
[0024] Figure 4 A schematic diagram of the rotor of an electric motor according to an embodiment of this application is shown.
[0025] Figure 5A partially enlarged view of the rotor lamination assembly of an electric motor according to an embodiment of this application is shown.
[0026] Figure 6 A partial structural schematic diagram of an electric motor according to an embodiment of this application is shown.
[0027] Figure 7 A schematic diagram of the rotor of an electric motor according to an embodiment of this application is shown.
[0028] Figure 8A and Figure 8B It shows along Figure 7 A cross-sectional view of line UU and a partially enlarged view of the cross-sectional view.
[0029] Figure 9A and Figure 9B It shows along Figure 7 The cross-sectional view of line VV and a partially enlarged view of the cross-sectional view.
[0030] Figure 10A and Figure 10B It shows along Figure 7 The cross-sectional view of line WW and a partially enlarged view of the cross-sectional view.
[0031] Explanation of reference numerals in the attached figures
[0032] 1. Rotor lamination assembly; 11. First lamination group; 12. Second lamination group; 13. Third lamination group; 14. Guide bar through hole.
[0033] 2 guide bars
[0034] 3-end ring
[0035] Axial direction C circumferential direction Detailed Implementation
[0036] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.
[0037] like Figures 4 to 10B As shown, an embodiment of this application proposes an electric motor, which includes a motor rotor and a motor stator. The motor can be, for example, an induction motor. This motor can be used in electric vehicles or hybrid vehicles, particularly for four-wheel drive vehicles. The motor can be located at the front axle, thus eliminating the need for a complex decoupling structure and reducing costs.
[0038] The motor rotor may include a rotor lamination assembly 1, guide bars 2, end rings 3, and a rotor shaft.
[0039] The rotor lamination assembly 1 can be cylindrical and can be sleeved on the rotor shaft. The rotor lamination assembly 1 is provided with multiple guide bar through holes 14, which extend along the axial direction A of the rotor lamination assembly 1 and are arranged along the circumferential direction C of the rotor lamination assembly 1. The end rings 3 are located at both ends along the axial direction A of the rotor lamination assembly 1.
[0040] The guide bar 2 can pass through the guide bar through hole 14 of the rotor lamination assembly 1 along the axial direction A of the motor rotor. Multiple guide bars 2 can be provided, and multiple guide bars 2 can be arranged along the circumferential direction C of the motor rotor. The two ends of the guide bar 2 extend to the opening of the guide bar through hole 14, and the end ring 3 is circular and connected to the two ends of the guide bar 2, connecting multiple guide bars 2 together.
[0041] Here, preferably, the end ring 3 and the conductor 2 are formed integrally, that is, formed in the same operation. For example, the two end rings 3 and the conductor 2 can be formed integrally by a casting process including casting, die casting, etc.
[0042] like Figure 6 As shown, the cross-sectional area of the transition portion connecting the two ends of the guide bar 2 to the end ring 3 is larger than the cross-sectional area of the main body portion in the middle of the guide bar 2. This results in a larger contact area at the transition portion connecting the guide bar 2 and the end ring 3, making it less prone to stress concentration or allowing it to withstand greater forces, thus increasing the connection strength of the guide bar 2. The transition portion connecting the guide bar 2 and the end ring 3 is located inside the guide bar through hole 14.
[0043] like Figure 5 , Figures 7 to 10B As shown, the rotor lamination assembly 1 can include rotor laminations of various specifications. Different specifications of rotor laminations can have the same number of guide bar through holes 14, but the circumferential dimensions and cross-sectional areas of the guide bar through holes 14 are different. For example, the rotor lamination assembly 1 can include a first lamination group 11, two second lamination groups 12, and two third lamination groups 13. The first lamination group 11, the second lamination group 12, and the third lamination group 13 can each include multiple rotor laminations.
[0044] Along the axial direction A of the motor rotor, the first lamination group 11 is located inside the two second lamination groups 12, or in other words, the first lamination group 11 is located between the two second lamination groups 12, and the two third lamination groups 13 are located outside the two second lamination groups 12 respectively. The circumferential dimension of the guide bar through hole 14 of the first lamination group 11 is smaller than the circumferential dimension of the guide bar through hole 14 of the second lamination group 12, and the circumferential dimension of the guide bar through hole 14 of the second lamination group 12 is smaller than the circumferential dimension of the guide bar through hole 14 of the third lamination group 13.
[0045] Here, the radial dimension of the guide bar through hole 14 of the first lamination group 11 can also be smaller than the radial dimension of the guide bar through hole 14 of the second lamination group 12, and the radial dimension of the guide bar through hole 14 of the second lamination group 12 can also be smaller than the radial dimension of the guide bar through hole 14 of the third lamination group 13.
[0046] The guide bar 2 and end ring 3 can be integrally cast. The guide bar 2 and end ring 3 can be made of aluminum (including aluminum alloys); however, this application is not limited to this. For example, the guide bar 2 and end ring 3 can also be made of other materials such as copper (including copper alloys). During the casting process, for example, the rotor lamination assembly 1 can be placed into the mold cavity first, and then molten aluminum can be poured into the mold cavity. The molten aluminum flows into the guide bar through-hole 14 of the rotor lamination assembly 1, and after cooling, the guide bar 2 and end ring 3 are integrally formed. Since the guide bar 2 is formed by casting, the shape and size of the guide bar through-hole 14 determine the shape and size of the guide bar 2.
[0047] The guide bar through hole 14 can be a strip-shaped hole extending radially along the rotor lamination assembly 1. The edge of the strip-shaped hole is arc-shaped, so that the cross-section of the guide bar 2 does not have a sharp corner structure, which can also reduce stress concentration.
[0048] It is understood that in the above specific embodiments, the rotor lamination assembly 1 includes three specifications of rotor lamination groups, but this application is not limited to this. The rotor lamination assembly may include at least two specifications of rotor lamination groups, so that the two ends of the guide bar have a larger cross-sectional area than the middle part, thereby alleviating the problem of stress concentration.
[0049] It is understood that rotor laminations with guide bar through holes 14 of different sizes can be obtained by stamping, thereby forming the aforementioned rotor lamination assembly. However, this application is not limited to this. For example, the rotor lamination assembly 1 with guide bar through holes 14 of the same size can be machined so that the circumferential and / or radial dimensions of the axial ends of the guide bar through holes 14 are larger than the circumferential and / or radial dimensions of the middle portion. When changing the size of the guide bar through holes 14 by machining, the circumferential and / or radial dimensions, or cross-sectional area, of the guide bar through holes 14 can be changed in a step-like manner or smoothly without a step. That is, the two axial ends of the guide bar through holes 14 can be formed into a trumpet shape, and the cross-sectional area of the guide bar through holes 14 increases as it moves outward axially.
[0050] It is understood that although the radial outer side of the guide bar through hole 14 is closed in the accompanying drawings, this application is not limited thereto. In other examples, the radial outer side of the guide bar through hole 14 may be open.
[0051] The motor described in this application exhibits lower stress concentration at the connection between the guide bars 2 and the end ring 3 of the motor rotor, allowing the motor rotor to rotate at higher speeds. Furthermore, it is less prone to deformation and damage, resulting in a longer service life for the motor.
[0052] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.
[0053] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.
[0054] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0055] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.
[0056] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.
Claims
1. A motor rotor, characterized in that: include: A rotor lamination assembly (1), the rotor lamination assembly (1) being cylindrical, the rotor lamination assembly (1) being provided with a plurality of guide bar through holes (14), the plurality of guide bar through holes (14) extending along an axial direction (A) of the rotor lamination assembly (1) and being arranged along a circumferential direction (C) of the rotor lamination assembly (1); A plurality of conductive bars (2), wherein the conductive bars (2) pass through the conductive bar through holes (14); as well as An end ring (3) is connected to both ends of the conductor bar (2), and the cross-sectional area of the transition portion where the conductor bar (2) and the end ring (3) are connected is larger than the cross-sectional area of the main body portion in the middle of the conductor bar (2).
2. The motor rotor according to claim 1, characterized in that: The transition portion where the conductor bar (2) and the end ring (3) are connected is located inside the conductor bar through hole (14).
3. The motor rotor according to claim 1, characterized in that: The rotor lamination assembly (1) comprises at least two sizes of rotor lamination groups, and the cross-sectional areas of the guide bar through holes (14) of the rotor lamination groups of different sizes are different.
4. The motor rotor according to claim 1, characterized in that: The rotor lamination assembly (1) comprises a first lamination group (11), two second lamination groups (12) and two third lamination groups (13), In the axial direction (A) of the motor rotor, the first lamination group (11) is located inside the two second lamination groups (12), and the two third lamination groups (13) are located outside the two second lamination groups (12), respectively. The circumferential size of the conductive bar through hole (14) of the first lamination group (11) is smaller than the circumferential size of the conductive bar through hole (14) of the second lamination group (12), and the circumferential size of the conductive bar through hole (14) of the second lamination group (12) is smaller than the circumferential size of the conductive bar through hole (14) of the third lamination group (13).
5. The motor rotor according to claim 1, characterized in that: The guide bar (2) and the end ring (3) are integrally formed by a casting process.
6. The motor rotor according to claim 1, characterized in that: The circumferential and / or radial dimensions of the two axial ends of the guide bar through hole (14) of the rotor lamination assembly (1) are made larger than the circumferential and / or radial dimensions of the middle portion by machining.
7. The motor rotor according to claim 1, characterized in that: At both axial ends of the guide bar (2), the cross-sectional area of the guide bar (2) increases as it moves toward the axial outer side, and the cross-sectional area of the guide bar (2) changes smoothly in a non-step-like manner.
8. The motor rotor according to claim 1, characterized in that: The guide bar through hole (14) is a strip-shaped hole extending in the radial direction of the rotor lamination assembly (1). The cross section of the conductive bar (2) does not have a sharp corner structure.
9. The motor rotor according to claim 1, characterized in that: The conductive bar (2) and the end ring (3) are made of aluminum or copper.
10. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 9.