Motor rotor
By using first and second balance rings in the motor rotor to cooperate with the recessed part of the permanent magnet, the problem of insufficient torque in conventional motors without increasing size is solved, thereby achieving increased motor torque and enhanced structural strength.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-03
AI Technical Summary
Conventional motors struggle to increase torque without increasing size; multi-pole permanent magnets have low bonding strength and are affected by centrifugal force; and increasing the air gap in a cylindrical shape reduces electromagnetic efficiency.
The first and second balance rings are used in conjunction with the recessed parts of the permanent magnet. By setting the protrusions of the first and second balance rings at the end of the permanent magnet, the centrifugal force is limited and the structural strength is improved, while keeping the rotor size unchanged.
Without increasing the size of the motor, the motor torque was improved, and the structural strength and market competitiveness of the product were enhanced.
Smart Images
Figure CN223967749U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a motor rotor. Background Technology
[0002] A typical motor structure includes: Figure 1 The rotor shaft 101, balance ring 102, and permanent magnet 103 are included. To achieve high torque, small motors typically have two options: one is to increase the diameter or length, but increasing the size usually limits application scenarios; the other is to use a multi-pole structure. However, multi-pole structures are affected by centrifugal force during motor operation, and the bonding strength of multi-pole permanent magnets is relatively low, making high-speed rotation difficult. To reduce the influence of centrifugal force, a structure is often used where a cylinder 104 is added around the permanent magnet 103, such as... Figure 1 As shown. However, the diameter of the cylinder 104 is larger than the diameter of the permanent magnet 103, which artificially increases the air gap on one side, reduces electromagnetic efficiency, and wastes space.
[0003] How to increase the torque of a motor without increasing its size has become a pressing technical challenge in the industry. Summary of the Invention
[0004] In order to at least solve the above-mentioned technical problems, the purpose of this utility model is to provide a motor rotor that, through the cooperation of the first recessed part and the first balance ring protrusion, ensures the motor torque without increasing the rotor size.
[0005] To achieve the above objectives, the motor rotor provided in this application includes:
[0006] Rotor shaft, permanent magnet and first balance ring;
[0007] The end of the rotor shaft protrudes beyond the end of the permanent magnet;
[0008] The end of the permanent magnet is provided with a first recess;
[0009] The first balancing ring is located at the end of the permanent magnet;
[0010] The first balance ring has a first balance ring protrusion on the side facing the end of the permanent magnet, and the first balance ring protrusion matches the first recess at the end of the permanent magnet; wherein, the outer wall of the first balance ring is located within the extended boundary of the outer wall of the permanent magnet.
[0011] Furthermore, the outer radial dimension of the first balancing ring is the same as the outer radial dimension of the permanent magnet.
[0012] Furthermore, the protrusion of the first balance ring is in a continuous ring shape on the first balance ring.
[0013] Furthermore, between the two first balancing rings, along the axial direction of the rotor shaft, there are permanent magnets distributed in multiple segments.
[0014] Furthermore, when the permanent magnets are distributed in multiple segments, it also includes:
[0015] The second balance ring connects the multi-segment permanent magnets along the axial direction of the rotor shaft.
[0016] The central axis of the second balancing ring coincides with the central axis of the rotor shaft.
[0017] Furthermore, the multi-segment permanent magnet has a second recess on the side facing the second balance ring;
[0018] The second balance ring has a protrusion on the side facing the permanent magnet, and the protrusion matches the second recess.
[0019] The outer wall of the second balancing ring is located within the extended boundary of the outer wall of the permanent magnet.
[0020] Furthermore, the outer radial dimension of the second balancing ring is the same as the outer radial dimension of the permanent magnet.
[0021] Furthermore, the protrusion of the second balance ring is in the form of a continuous ring on the second balance ring.
[0022] Furthermore, the first recess is a concave chamfer, or a stepped shape; and / or,
[0023] The second recess is an inwardly concave chamfer or a stepped shape.
[0024] Furthermore, both the first and second balance rings are perpendicular to the rotor shaft.
[0025] The motor rotor of this embodiment includes: a rotor shaft, a permanent magnet, and a first balancing ring; the end of the rotor shaft protrudes from the end of the permanent magnet; the end of the permanent magnet has a first recess; the first balancing ring is located at the end of the permanent magnet; the side of the first balancing ring facing the end of the permanent magnet has a first balancing ring protrusion, which matches the first recess at the end of the permanent magnet; wherein, the outer wall of the first balancing ring is located within the extended boundary of the outer wall of the permanent magnet. Through the cooperation of the first recess and the first balancing ring protrusion, the motor torque is ensured without increasing the rotor size; the cooperation of the second recess and the second balancing ring protrusion further restricts the centrifugal force of the permanent magnet, improving the structural strength of the product and enhancing its market competitiveness. Attached Figure Description
[0026] The accompanying drawings are provided to further illustrate the present application and form part of the specification. Together with the embodiments of the present application, they serve to explain the present application but do not constitute a limitation thereof. In the drawings:
[0027] Figure 1 This is a schematic diagram of an existing motor structure;
[0028] Figure 2 This is a schematic diagram of the axial direction of a motor rotor according to an embodiment of this application;
[0029] Figure 3 This is a schematic diagram of the axial direction of the motor rotor according to another embodiment of this application.
[0030] Explanation of reference numerals in the attached figures:
[0031] 101-Rotor shaft; 102-Balance ring; 103-Permanent magnet; 104-Cylinder; 201-First balance ring protrusion; 202-First balance ring; 301-Second balance ring; 302-Second balance ring protrusion. Detailed Implementation
[0032] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.
[0033] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.
[0034] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.
[0035] It should be noted that the terms "one" and "multiple" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Multiple" should be understood as two or more.
[0036] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0037] This application provides an embodiment of a motor rotor, comprising:
[0038] Rotor shaft, permanent magnet and first balance ring;
[0039] The end of the rotor shaft protrudes beyond the end of the permanent magnet;
[0040] The end of the permanent magnet is provided with a first recess;
[0041] The first balancing ring is located at the end of the permanent magnet;
[0042] The first balance ring has a first balance ring protrusion on the side facing the end of the permanent magnet, and the first balance ring protrusion matches the first recess at the end of the permanent magnet; wherein, the outer wall of the first balance ring is located within the extended boundary of the outer wall of the permanent magnet.
[0043] Example 1
[0044] Figure 1 This is a schematic diagram of an existing motor structure. Figure 2 This is a schematic diagram of the axial direction of a motor rotor according to an embodiment of this application. Figure 3 This is a schematic diagram of the axial direction of the motor rotor according to another embodiment of this application. The following will be combined with... Figure 2-3 The motor rotor structure of the embodiments of this application will be described in detail.
[0045] In one exemplary embodiment, the electronic rotor of this application includes a rotor shaft 101 and a permanent magnet 103.
[0046] In one exemplary embodiment, the rotor shaft 101 is a cylindrical shaft, for example, the rotor shaft 101 is a circular shaft.
[0047] In one exemplary embodiment, the rotor shaft 101 may be a cylindrical shaft of metal or non-metal, as needed.
[0048] In one exemplary embodiment, the end of the rotor shaft 101 protrudes beyond the end of the permanent magnet 103.
[0049] In an exemplary embodiment, the rotor shaft 101 may be a segmented structure as needed, for example, the rotor shaft 101 may be a two-segment structure. In this case, the two-segment rotor shaft 101 is respectively connected to the outer side of the end of the permanent magnet 103. The connection method may be adhesive bonding, or one end of the rotor shaft 101 may be embedded in the permanent magnet 103 and the other end may protrude from the end of the permanent magnet 103.
[0050] In one exemplary embodiment, the rotor shaft 101 may also be a single-section structure as needed, in which case the permanent magnet 103 is sleeved on the rotor shaft 101, that is, the permanent magnet 103 is wrapped around the outside of the rotor shaft 101 in a ring shape.
[0051] In one exemplary embodiment, the permanent magnet 103 is disposed in the middle of the rotor shaft 101. This can be understood as the permanent magnet 103 enclosing the middle position of the rotor shaft 101, with both ends of the rotor shaft 101 exposed. Figure 2 and Figure 3 As shown.
[0052] In one exemplary embodiment, the permanent magnet 103 has a multi-pole structure.
[0053] In one exemplary embodiment, the permanent magnet 103 has a first recess at its end.
[0054] In one exemplary embodiment, the first recess may be an inwardly concave chamfer or a stepped shape at the end of the permanent magnet 103.
[0055] In one exemplary embodiment, a concave chamfer is used, for example, a radially outer chamfer at the end.
[0056] In one exemplary embodiment, when the first recess is stepped at the end of the permanent magnet 103, the first recess can be a single step or multiple steps.
[0057] In one exemplary embodiment, first balance rings 202 are provided at both ends of the rotor body, that is, first balance rings 202 are respectively provided at the left and right ends of the rotor shaft 101, such as... Figure 2 and Figure 3 As shown.
[0058] In one exemplary embodiment, the rotor shaft 101 passes through the first balance ring 202.
[0059] In one exemplary embodiment, the first balance ring 202 has a first balance ring protrusion 201 on the side facing the end of the permanent magnet 103, such as... Figure 2 and Figure 3 As shown.
[0060] In one exemplary embodiment, the first balance ring protrusion 201 matches the first recess at the end of the permanent magnet 103.
[0061] In one exemplary embodiment, the outer wall of the first balancing ring 202 is located within the extended boundary of the outer wall of the permanent magnet 103.
[0062] In an exemplary embodiment, the matching of the first balance ring protrusion 201 with the first recess at the end of the permanent magnet 103 can be understood as the first recess fitting with the first balance ring protrusion 201 when the first balance ring 202 is attached to the end of the permanent magnet 103.
[0063] In an exemplary embodiment, when the permanent magnet 103 rotates, the first balance ring protrusion 201 is used to limit the centrifugal force of the permanent magnet 103; because when the permanent magnet 103 rotates with the rotor shaft 101, the permanent magnet 103 will have an outward centrifugal force, and the arrangement of the first balance ring protrusion 201 and the first recessed portion, the first balance ring protrusion 201 limits the centrifugal force of the permanent magnet 103, so that the permanent magnet 103 is fixed on the rotor shaft 101.
[0064] In an exemplary embodiment, the outer radial dimension of the first balance ring 202 is the same as the outer radial dimension of the permanent magnet 103. That is, although the first balance ring protrusion 201 on the first balance ring 202 located on the left and right sides of the permanent magnet 103 is a protruding component, the first balance ring protrusion 201 on the first balance ring 202 on the left and right sides of the permanent magnet 103 is a protrusion in the opposite direction. That is, the first balance ring protrusion 201 is a protrusion in the axial direction of the first balance ring 202, not a protrusion in the radial direction of the first balance ring 202.
[0065] In one exemplary embodiment, the protrusion 201 of the first balance ring protrusion on the first balance ring 202 is matched with the first recess, that is, the protrusion of the first balance ring protrusion 201 is not greater than the recess size of the first recess.
[0066] In an exemplary embodiment, taking a permanent magnet 103 with a four-pole structure as an example, the first recess structure on adjacent permanent magnets 103 may be the same or different as needed; for example, the first recess of the first balance ring 202 facing the same side of the permanent magnet 103 with a four-pole structure may all be chamfers or steps of the same size, or they may be alternately set with chamfers and steps.
[0067] In one exemplary embodiment, the first balance rings 202 on the left and right sides of the permanent magnet 103 have the same structure and size.
[0068] In one exemplary embodiment, the first balance ring protrusion 201 is in a continuous ring shape on the first balance ring 202, which can be understood as the first balance ring protrusion 201 being a ring-shaped integral component.
[0069] In one exemplary embodiment, between the two first balancing rings 202 and along the axial direction of the rotor shaft 101, there are multiple segments of permanent magnets 103 distributed in a multi-segment manner; it can be understood that there are multiple permanent magnets 103 between the two first balancing rings 202.
[0070] In one exemplary embodiment, each permanent magnet 103 is distributed in a single segment or multiple segments.
[0071] In one exemplary embodiment, when each permanent magnet 103 is distributed in a segment, such as Figure 2 As shown.
[0072] In one exemplary embodiment, each permanent magnet 103 is distributed in multiple segments, for example, when each permanent magnet 103 is distributed in two segments, such as... Figure 3 As shown, the specific number of segments of each permanent magnet 103 can be designed as needed. In this application, when the permanent magnet 103 is multi-segmented, the explanation will be based on the example of a two-segment permanent magnet 103.
[0073] In an exemplary embodiment, when the permanent magnet 103 is distributed in multiple segments, it further includes a second balancing ring 301.
[0074] In an exemplary embodiment, the multi-segment permanent magnets 103 are connected by a second balancing ring 301. This can be understood as the same permanent magnet 103 being distributed in multiple segments, with the segments of the permanent magnet 103 connected by the second balancing ring 301. The second balancing ring 301 also simultaneously connects the segments of multiple permanent magnets 103, meaning that multiple permanent magnets 103 share the same second balancing ring 301.
[0075] In one exemplary embodiment, when the rotor shaft 101 has a single-segment structure, the rotor shaft 101 passes through the second balance ring 301.
[0076] In one exemplary embodiment, the second balancing ring 301 may or may not be in direct contact with the rotor shaft 101, depending on the need.
[0077] In one exemplary embodiment, the central axis of the second balance ring 301 coincides with the central axis of the rotor shaft 101.
[0078] In one exemplary embodiment, when the permanent magnet 103 is distributed in a multi-segment manner, the permanent magnets 103 with multiple poles are all distributed in a multi-segment manner with the same size and structure.
[0079] In one exemplary embodiment, the multi-segment permanent magnet 103 has a second recess on the side facing the second balance ring 301.
[0080] In one exemplary embodiment, the second balance ring 301 has a second balance ring protrusion 302 on the side facing the permanent magnet 103. Because the second balance ring 301 connects the permanent magnets 103 on the left and right sides, the second balance ring 301 has second balance ring protrusions 302 on both the left and right sides. Figure 3 As shown.
[0081] In one exemplary embodiment, the second balance ring protrusion 302 matches the second recess.
[0082] In one exemplary embodiment, the outer wall of the second balancing ring 301 is located within the extended boundary of the outer wall of the permanent magnet 103.
[0083] In one exemplary embodiment, when the permanent magnet 103 rotates, the second balance ring protrusion 302 is used to limit the centrifugal force of the permanent magnet 103.
[0084] In an exemplary embodiment, the outer radial dimension of the second balance ring 301 is the same as the outer radial dimension of the permanent magnet 103; that is, the second balance ring protrusion 302 on the second balance ring 301 is an axial protrusion.
[0085] In one exemplary embodiment, the size of the second balance ring protrusion 302 matches the size of the second recess, that is, the size of the protrusion of the second balance ring 302 is not greater than the size of the recess of the second recess.
[0086] In one exemplary embodiment, the second balancing ring 301 includes a second balancing ring protrusion 302 on the side facing the permanent magnet 103. Since both the left and right sides of the second balancing ring 301 are permanent magnets 103, a second balancing ring protrusion 302 is provided on both the left and right sides of the second balancing ring 301. Figure 3 As shown.
[0087] In one exemplary embodiment, the second balance ring protrusion 302 on the side of the second balance ring 301 facing the permanent magnet 103 is in a continuous ring shape, which can be understood as the second balance ring protrusion 302 being a ring-shaped integral component.
[0088] In one exemplary embodiment, the second recess is an inwardly concave chamfer or a stepped shape.
[0089] In one exemplary embodiment, when the second recess is stepped at the end of the permanent magnet 103, the second recess can be a single step or multiple steps.
[0090] In an exemplary embodiment, the second recesses of adjacent permanent magnets 103 at the point of contact with the second balancing ring 301 can have the same or different structures. For example, the second recesses on the multi-pole permanent magnets 103 on the same side of the second balancing ring 301 can all be chamfers of the same size and shape or steps of the same size and shape, or they can be alternating between chamfers and steps. Taking the letter A as an example when the second recess is a concave chamfer, and the letter B as an example when the second recess is a step, then the adjacent second recesses can be arranged in the pattern AAAAAA or ABABAB.
[0091] In one exemplary embodiment, the first recess may have the same shape and size as the second recess, as needed.
[0092] In one exemplary embodiment, the second balance ring protrusions 302 on the left and right sides of the second balance ring 301 may be the same or different.
[0093] In one exemplary embodiment, when the permanent magnet 103 has a multi-pole structure, the multiple permanent magnets 103 are arranged at equal intervals around the rotor shaft 101.
[0094] In one exemplary embodiment, both the first balance ring 202 and the second balance ring 301 are perpendicular to the rotor shaft 101.
[0095] In one exemplary embodiment, the central axis of the first balance ring 202, the central axis of the second balance ring 301, and the central axis of the rotor shaft 101 coincide.
[0096] Example 2
[0097] Example 2 is an electric motor, including the motor rotor of the above-described example.
[0098] Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model, but the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.
Claims
1. An electric machine rotor, characterized in that, The rotor shaft, the permanent magnet and the first balance ring are included. The end of the rotor shaft protrudes from the end of the permanent magnet. The end of the permanent magnet is provided with a first recess. The first balance ring is located at the end of the permanent magnet. The side of the first balance ring facing the end of the permanent magnet is provided with a first balance ring protruding part which matches the first recess of the end of the permanent magnet; wherein the outer side wall of the first balance ring is located within the extension boundary of the outer side wall of the permanent magnet.
2. The electric machine rotor of claim 1, wherein, The outer radial dimension of the first balance ring is the same as the outer radial dimension of the permanent magnet.
3. The motor rotor of claim 1, wherein The first balance ring protruding part is in a continuous ring shape on the first balance ring.
4. The motor rotor of claim 1, wherein The permanent magnet is distributed in multiple sections along the axial direction of the rotor shaft.
5. The electric machine rotor of claim 4, wherein, When the permanent magnet is distributed in multiple sections, it further includes: A second balance ring, the permanent magnet distributed in multiple sections is connected by the second balance ring along the axial direction of the rotor shaft; The central axis of the second balance ring coincides with the central axis of the rotor shaft.
6. The motor rotor of claim 5, wherein The side of the permanent magnet distributed in multiple sections facing the second balance ring is provided with a second recess; The side of the second balance ring facing the permanent magnet is provided with a second balance ring protruding part which matches the second recess; Wherein the outer side wall of the second balance ring is located within the extension boundary of the outer side wall of the permanent magnet.
7. The motor rotor of claim 6, wherein The outer radial dimension of the second balance ring is the same as the outer radial dimension of the permanent magnet.
8. The motor rotor of claim 7, wherein, The second balance ring protruding part is in a continuous ring shape on the second balance ring.
9. The motor rotor of claim 6, wherein, The first recess is an inner concave chamfer or in a stepped shape; and / or, The second recess is an inner concave chamfer or in a stepped shape.
10. The motor rotor of claim 5, wherein, The first balance ring and the second balance ring are both perpendicular to the rotor shaft.