Motor rotor
By combining a recessed portion and a protruding balance ring in the motor rotor, the problem of insufficient torque in the motor without increasing its size is solved, high-strength permanent magnet fixation is achieved, and the performance of the motor is improved.
Patent Information
- Application Number
- CN202520419975.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Existing motors cannot increase torque without increasing size, and the low bonding strength of permanent magnets with multi-pole structures makes it difficult to achieve high-speed rotation.
By combining the first recess and the first balance ring protrusion at the end of the permanent magnet, and the design of the second recess and the second balance ring protrusion, the centrifugal force of the permanent magnet is limited, the structural strength is improved, and the rotor size is not increased.
Without increasing the size of the motor, the torque of the motor was increased and the bonding strength of the permanent magnet was enhanced, thereby improving the market competitiveness of the motor.
Smart Images
Figure CN223885056U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field especially is related to a motor rotor. BACKGROUND
[0002] The conventional motor structure includes the rotor shaft 101, the balance ring 102 and the permanent magnet 103. Figure 1 In order to obtain large torque, the small motor usually has two choices, one is to increase the diameter or increase the length, but the scheme of increasing the size usually limits the application scene, the second is to adopt the structure of multiple pairs of poles, the multiple pairs of poles are affected by the centrifugal force during the motor operation, the adhesion strength of the multiple pairs of poles permanent magnet after adhesion is low, and high-speed rotation is difficult to realize. Figure 1 In order to reduce the influence of centrifugal force, the structure of increasing the cylinder 104 on the periphery of the permanent magnet 103 is adopted, as shown in the figure.
[0003] How to improve the torque of the motor without increasing the volume of the motor has become a technical problem to be solved in the industry. SUMMARY
[0004] In order to solve at least the above technical problems, the utility model discloses a motor rotor, through the cooperation of the first recess and the first balance ring protruding part, the motor torque is guaranteed without increasing the size of the rotor.
[0005] In order to achieve the above purpose, the motor rotor provided by the application comprises:
[0006] The rotor shaft, the permanent magnet and the first balance ring;
[0007] The end of the rotor shaft protrudes from the end of the permanent magnet;
[0008] The end of the permanent magnet is provided with a first recess;
[0009] The first balance ring is located at the end of the permanent magnet;
[0010] The side of the first balance ring facing the end of the permanent magnet is provided with a plurality of intermittent and uniformly distributed first balance ring protruding parts, the first balance ring protruding part is matched with the first recess of the end of the permanent magnet; wherein the outer side wall of the first balance ring is located in the extension boundary of the outer side wall of the permanent magnet.
[0011] Further, the outer radial dimension of the first balance ring is the same as the outer radial dimension of the permanent magnet.
[0012] Further, the permanent magnet comprises at least two annularly attached permanent magnet units, and the number of the first balance ring protrusions is not less than the number of the permanent magnet units, wherein a first balance ring protrusion is located at the joint between two adjacent permanent magnet units.
[0013] Further, the permanent magnet comprises at least two annularly attached permanent magnet units, and the number of the first balance ring protrusions is not less than the number of the permanent magnet units, wherein a first balance ring protrusion is located at the joint between two adjacent permanent magnet units.
[0014] Further, the permanent magnet comprises at least two annularly attached permanent magnet units, and the number of the first balance ring protrusions is not less than the number of the permanent magnet units, wherein a first balance ring protrusion is located at the joint between two adjacent permanent magnet units.
[0015] Further, when the permanent magnet is distributed in multiple sections, it further comprises:
[0016] 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;
[0017] The central axis of the second balance ring coincides with the central axis of the rotor shaft.
[0018] Further, the side of the permanent magnet distributed in multiple sections facing the second balance ring is provided with a second recess;
[0019] The side of the second balance ring facing the permanent magnet is provided with a second balance ring protrusion, and the second balance ring protrusion matches the second recess;
[0020] The outer side wall of the second balance ring is located within the extension boundary of the outer side wall of the permanent magnet.
[0021] Further, the outer radial dimension of the second balance ring is the same as the outer radial dimension of the permanent magnet.
[0022] Further, the first recess is an inner concave chamfer or a stepped shape; and / or
[0023] The second recess is an inner concave chamfer or a stepped shape.
[0024] Further, the first balance ring and the second balance ring are both perpendicular to the rotor shaft.
[0025] The motor rotor of the embodiment of the present application comprises: a rotor shaft, a permanent magnet and a first balance ring; 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 plurality of intermittent and uniformly distributed first balance ring protrusions, the first balance ring protrusions are matched with 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. Through the cooperation of the first recess and the first balance ring protrusion, the motor torque is guaranteed without increasing the size of the rotor; through the cooperation of the second recess and the second balance ring protrusion, the centrifugal force of the permanent magnet is further limited, and the structural strength of the product is improved; the market competitiveness of the product is improved. BRIEF DESCRIPTION OF DRAWINGS
[0026] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and together with the application, serve to explain the present application, and do not constitute a limitation on the present application. In the drawings:
[0027] Figure 1 is a schematic diagram of an existing motor structure;
[0028] Figure 2 is a schematic diagram of the permanent magnet of the embodiment of the present application being sleeved on the rotor shaft;
[0029] Figure 3 is a side view of Figure 2 ;
[0030] Figure 4 is a schematic diagram of the motor rotor structure of the embodiment of the present application;
[0031] Figure 5 is a schematic diagram of the motor rotor shaft of another embodiment of the present application.
[0032] Explanation of reference signs:
[0033] 101-rotor shaft; 102-balance ring; 103-permanent magnet; 104-cylinder; 201-first recess; 202-first balance ring protrusion; 203-first balance ring; 301-second balance ring; 302-second balance ring protrusion. DETAILED DESCRIPTION
[0034] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments set forth herein, but rather, these embodiments are provided to more thoroughly and completely understand the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the scope of protection of the present application.
[0035] It should be understood that the various steps recited in the method embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method embodiments can include additional steps and / or omit performing the steps shown. The scope of the present application is not limited in this respect.
[0036] The term "comprising" and variations thereof as used herein are open-ended, and mean "including but not limited to". The term "based on" means "based, at least in part, 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". Related terms shall be construed accordingly.
[0037] It should be noted that the terms "a" and "an" and "the" and similar referents used in the context of describing the application (especially in the context of claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. Recitation of "multiple" means two or more.
[0038] Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0039] The embodiment of the present application provides a motor rotor, comprising:
[0040] a rotor shaft, a permanent magnet and a first balance ring;
[0041] The end of the rotor shaft protrudes from the end of the permanent magnet;
[0042] The end of the permanent magnet is provided with a first recess;
[0043] The first balance ring is located at the end of the permanent magnet;
[0044] The side of the first balance ring facing the end of the permanent magnet is provided with a plurality of intermittent and uniformly distributed first balance ring protrusions, the first balance ring protrusions match 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.
[0045] Embodiment 1
[0046] Figure 1 is a schematic diagram of the existing motor structure, Figure 2 is a schematic diagram of the permanent magnet sleeve of the embodiment of the present application on the rotor shaft, Figure 3 is Figure 2 is a side view of Figure 4 is a schematic diagram of the motor rotor structure of the embodiment of the present application, Figure 5 is an axial schematic diagram of the motor rotor of another embodiment of the present application, which will be described below with reference to Figures 2-5The motor rotor structure of the embodiment of the present application is described in detail.
[0047] In an exemplary embodiment, the electronic rotor of the embodiment of the present application comprises a rotor shaft 101 and a permanent magnet 103.
[0048] In an exemplary embodiment, the rotor shaft 101 is a cylindrical shaft, for example, the rotor shaft 101 is a circular cylindrical shaft.
[0049] In an exemplary embodiment, the rotor shaft 101 can be a metal or non-metal circular cylindrical shaft according to requirements.
[0050] In an exemplary embodiment, the end of the rotor shaft 101 protrudes from the end of the permanent magnet 103.
[0051] In an exemplary embodiment, the permanent magnet 103 is sleeved on the rotor shaft 101, that is, the permanent magnet 103 is annularly wrapped outside the rotor shaft 101.
[0052] In an exemplary embodiment, the permanent magnet 103 is arranged at the middle part of the rotor shaft 101, which can be understood as that the permanent magnet 103 wraps the middle position of the rotor shaft 101, and the two ends of the rotor shaft 101 are exposed, as shown in Figure 2 .
[0053] In an exemplary embodiment, the permanent magnet 103 has a multi-pole structure.
[0054] In an exemplary embodiment, the end of the permanent magnet 103 is provided with a first recess 201.
[0055] In an exemplary embodiment, the first recess 201 can be an inner recessed chamfer or a stepped shape at the end of the permanent magnet 103.
[0056] In an exemplary embodiment, the inner recessed chamfer is, for example, a radial outer chamfer at the end.
[0057] In an exemplary embodiment, when the first recess 201 is a stepped shape at the end of the permanent magnet 103, it can be one step or a plurality of stepped shapes, as shown in Figure 2 , Figure 3 and Figure 4 .
[0058] In an exemplary embodiment, the first balance ring 203 is arranged at the two ends of the rotor body, that is, the first balance ring 203 is arranged at the left and right ends of the rotor shaft 101, as shown in Figure 4 and Figure 5 .
[0059] In an exemplary embodiment, the rotor shaft 101 penetrates the first balance ring 203.
[0060] In an exemplary embodiment, the first balance ring 203 is provided with a plurality of discontinuous and uniformly distributed first balance ring protrusions 202 on the side facing the end of the permanent magnet 103, as shown in Figure 4 and Figure 5 .
[0061] In an exemplary embodiment, the first balance ring protrusions 202 match the first recesses 201 on the end of the permanent magnet 103.
[0062] In an exemplary embodiment, the outer sidewall of the first balance ring 203 is within the extension boundary of the outer sidewall of the permanent magnet 103.
[0063] In an exemplary embodiment, the matching of the first balance ring protrusions 202 with the first recesses 201 on the end of the permanent magnet 103 can be understood as the matching of the first recesses 201 with the first balance ring protrusions 202 when the first balance ring 203 is attached to the end of the permanent magnet 103.
[0064] In an exemplary embodiment, the first balance ring protrusions 202 are used to limit the centrifugal force of the permanent magnet 103 when the permanent magnet 103 rotates; because the permanent magnet 103 rotates with the rotor shaft 101, the permanent magnet 103 will have a centrifugal force outward due to the centrifugal force, and the arrangement of the first balance ring protrusions 202 and the first recesses 201 limits the centrifugal force of the permanent magnet 103, so that the permanent magnet 103 is fixed on the rotor shaft 101.
[0065] In an exemplary embodiment, the outer radial dimension of the first balance ring 203 is not greater than the outer radial dimension of the permanent magnet 103 as needed.
[0066] In an exemplary embodiment, the outer radial dimension of the first balance ring 203 is the same as the outer radial dimension of the permanent magnet 103, i.e., the first balance ring protrusions 202 on the first balance ring 203 on the left and right sides of the permanent magnet 103 are protrusions in the direction of the first balance ring 203, i.e., the first balance ring protrusions 202 are protrusions in the axial direction of the first balance ring 203 and not in the radial direction of the first balance ring 203.
[0067] In an exemplary embodiment, the size of the first balance ring protrusions 202 protruding on the first balance ring 203 matches the size of the first recesses 201, i.e., the size of the first balance ring protrusions 202 protruding is not greater than the size of the first recesses 201.
[0068] In an exemplary embodiment, the permanent magnet 103 comprises at least two annularly attached permanent magnet units, and the number of the first balance ring protrusions 202 is not less than the number of the permanent magnet units, wherein a first balance ring protrusion 202 corresponds to the joint between two adjacent permanent magnet units; of course, a first balance ring protrusion 202 can also correspond to the side wall of a permanent magnet unit according to needs.
[0069] In an exemplary embodiment, taking the four-pole structure of the permanent magnet 103 as an example, the first recess 201 structures on the adjacent permanent magnets 103 can be the same or different according to needs; for example, the first recess 201 of the first balance ring 203 facing the same side of the four-pole structure of the permanent magnet 103 can be a chamfer of the same size or a step of the same size, or a chamfer and a step arranged alternately.
[0070] In an exemplary embodiment, the first balance ring 203 structures on the left and right sides of the permanent magnet 103 are the same.
[0071] In an exemplary embodiment, the first balance ring protrusion 202 comprises a plurality of first balance ring protrusions 202, and the plurality of first balance ring protrusions 202 are discontinuously protruding around the rotor shaft 101, that is, the plurality of first balance ring protrusions 202 are discontinuously protruding on the first balance ring 203.
[0072] In an exemplary embodiment, the matching relationship between the first balance ring protrusion 202 and the first recess 201 on each first balance ring 203 can be that one first balance ring protrusion 202 matches one first recess 201, and / or one first balance ring protrusion 202 matches two adjacent first recesses 201, and / or a plurality of adjacent first balance ring protrusions 202 match one second recess 201.
[0073] In an exemplary embodiment, the permanent magnet 103 comprises a plurality of permanent magnets 103 distributed in multiple sections along the axial direction of the rotor shaft 101 between two first balance rings 203; it can be understood that the permanent magnet 103 comprises a plurality of permanent magnets 103.
[0074] In an exemplary embodiment, each permanent magnet 103 is distributed in one section or multiple sections.
[0075] In an exemplary embodiment, when each permanent magnet 103 is distributed in one section, as shown in Figure 2 and Figure 4 .
[0076] In an exemplary embodiment, each permanent magnet 103 is distributed in multiple sections, for example, when each permanent magnet 103 is distributed in two sections, as shown in Figure 5The permanent magnet 103 is specifically designed by several segments according to requirements. The permanent magnet 103 is taken as an example of two segments for explanation and description.
[0077] In an exemplary embodiment, when the permanent magnet 103 is in a multi-segment distribution, the second balance ring 301 is further included.
[0078] In an exemplary embodiment, the connection between the multi-segment permanent magnets 103 through the second balance ring 301 can be understood as that when the permanent magnet 103 is in a multi-segment distribution, the second balance ring 301 is connected between the multiple segments of the permanent magnet 103, and the second balance ring 301 also simultaneously realizes the connection between the multiple segments of multiple permanent magnets 103, that is, multiple permanent magnets 103 share the same second balance ring 301.
[0079] In an exemplary embodiment, the rotor shaft 101 penetrates the second balance ring 301.
[0080] In an exemplary embodiment, the central axis of the second balance ring 301 coincides with the central axis of the rotor shaft 101.
[0081] In an exemplary embodiment, when the permanent magnet 103 is in a multi-segment distribution, the multiple pairs of pole permanent magnets 103 are in a multi-segment distribution of the same size and structure.
[0082] In an exemplary embodiment, the multi-segment permanent magnet 103 is provided with a second recess on the side facing the second balance ring 301.
[0083] In an exemplary embodiment, the second balance ring 301 is provided with a second balance ring protruding portion 302 on the side facing the permanent magnet 103. Because the second balance ring 301 connects the left and right permanent magnets 103, the second balance ring 301 is provided with the second balance ring protruding portion 302 on the left and right sides.
[0084] In an exemplary embodiment, the second balance ring protruding portion 302 matches the second recess.
[0085] In an exemplary embodiment, the outer side wall of the second balance ring 301 is located within the extension boundary of the outer side wall of the permanent magnet 103.
[0086] In an exemplary embodiment, when the permanent magnet 103 rotates, the second balance ring protruding portion 302 is used to limit the centrifugal force of the permanent magnet 103.
[0087] In an exemplary embodiment, according to requirements, the outer radial dimension of the second balance ring 301 is not greater than the outer radial dimension of the permanent magnet 103.
[0088] 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 axially protruding.
[0089] In an exemplary embodiment, the size of the second balance ring protrusion 302 matches the size of the second recess; that is, the protruding size of the second balance ring protrusion 302 is not greater than the recessed size of the second recess.
[0090] In an exemplary embodiment, the side of the second balance ring 301 facing the permanent magnet 103 includes a plurality of second balance ring protrusions 302, because both sides of the second balance ring 301 are the permanent magnet 103, and therefore both sides of the second balance ring 301 are provided with the second balance ring protrusion 302.
[0091] In an exemplary embodiment, the matching relationship between the second balance ring protrusion 302 on the side of the second balance ring 301 facing the permanent magnet 103 and the adjacent second recess is that one second balance ring protrusion 302 matches one second recess, and / or one second balance ring protrusion 302 matches two adjacent second recesses, and / or a plurality of adjacent second balance ring protrusions 302 match one second recess.
[0092] In an exemplary embodiment, the second balance ring protrusion 302 is discontinuously protruding around the rotor shaft 101; that is, a plurality of second balance ring protrusions 302 are discontinuously protruding on the second balance ring 301.
[0093] In an exemplary embodiment, the second recess is a recessed chamfer, or is in the form of a step.
[0094] In an exemplary embodiment, when the second recess is in the form of a step at the end of the permanent magnet 103, the second recess can be one step or a plurality of steps.
[0095] In an exemplary embodiment, among the permanent magnets 103 that are in contact with the second balance ring 301, the second recess structures of adjacent permanent magnets 103 can be the same or different; for example, the second recesses on the permanent magnets 103 of the same pair of pole structure on the same side of the second balance ring 301 can be chamfers of the same size and shape or steps of the same size and shape, or can be alternately arranged as chamfers and steps; taking the second recess as a recessed chamfer as an example with the letter A, and taking the second recess as a step as an example with the letter B, then the adjacent second recesses can be arranged in the style of AAAAAA or in the style of ABABAB.
[0096] In an exemplary embodiment, the second balance ring protrusions 302 on the left and right sides of the second balance ring 301 can be the same or different.
[0097] In an exemplary embodiment, the first recesses can be the same in shape and size as the second recesses, as needed.
[0098] In an exemplary embodiment, when the permanent magnets 103 are in a multi-pole structure, the plurality of permanent magnets 103 are arranged at equal intervals around the rotor shaft 101.
[0099] In an exemplary embodiment, the first balance ring 203 and the second balance ring 301 are both perpendicular to the rotor shaft 101.
[0100] In an exemplary embodiment, the central axis of the first balance ring 203, the central axis of the second balance ring 301, and the central axis of the rotor shaft 101 coincide.
[0101] Embodiment 2
[0102] Embodiment 2 is an electric machine, comprising the electric machine rotor of the above embodiments.
[0103] Although the embodiments disclosed by the present application are as above, the content is only the embodiment adopted for the purpose of facilitating the understanding of the present application, and is not used to limit the present application. Any person skilled in the art of the present application, without departing from the spirit and scope of the present application disclosed, can make any modification and change in the form and details of the implementation, but the patent protection scope of the present application shall be subject to the scope defined by 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 plurality of intermittent and uniformly distributed first balance ring protrusions, which match 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 permanent magnet includes at least two annularly fitted permanent magnet units, and the number of the first balance ring protrusions is not less than the number of the permanent magnet units, wherein a first balance ring protrusion is located at the joint of two adjacent permanent magnet units.
4. The motor rotor of claim 1, wherein The permanent magnet includes at least two annularly fitted permanent magnet units, and the number of the first balance ring protrusions is not less than the number of the permanent magnet units, wherein a first balance ring protrusion is located at the side wall of a permanent magnet unit.
5. The motor rotor of claim 1, wherein The permanent magnet is distributed in multiple sections along the axial direction of the rotor shaft.
6. The motor rotor of claim 5, 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.
7. The motor rotor of claim 6, 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 protrusion, which matches the second recess. The outer side wall of the second balance ring is located within the extension boundary of the outer side wall of the permanent magnet.
8. The motor rotor of claim 7, wherein, The outer radial dimension of the second balance ring is the same as the outer radial dimension of the permanent magnet.
9. The motor rotor of claim 7, wherein, The first recess is an inwardly recessed chamfer or a stepped shape; and / or The second recess is an inwardly recessed chamfer or a stepped shape.
10. The motor rotor of claim 7, wherein, The first balance ring and the second balance ring are both perpendicular to the rotor shaft.