Ultra-high speed motor shaft and rotor
By designing a recessed area and supporting ridge structure on the motor shaft, combined with a pressure ring design, the problems of difficult motor assembly and poor cleanliness were solved, thereby increasing the motor speed and enhancing its torque transmission capability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FANGDE ZHIDU (SHANGHAI) MECHANICAL & ELECTRICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502999U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor structure technology, and in particular relates to an ultra-high speed motor shaft and rotor. Background Technology
[0002] Existing motor shafts are purely circular shafts, and motors rely on a large interference fit between the core and the shaft to meet high-speed torque transmission requirements. However, as the required motor speed continues to increase, purely circular shaft motors attempt to achieve high-speed torque transmission by relying on even larger interference fits. However, the large interference fit solution has unsolvable problems in terms of manufacturing processes, such as difficulty in assembling the rotor core and the shaft, and metal shavings remaining on the outer surface after the shaft and rotor core are assembled, resulting in poor cleanliness.
[0003] Existing pure circular shaft structure motors do not have the ability to transmit torque at high speeds, and the increase of motor speed has encountered a bottleneck. Most of them can no longer break through 18,000 rpm, so there is an urgent need to design a motor shaft that can meet the high speed conditions. Utility Model Content
[0004] To solve the above-mentioned technical problems, the first objective of this utility model is to provide an ultra-high speed motor shaft that is easy to assemble and can meet the requirements of high-speed torque transmission. The second objective of this utility model is to provide a rotor.
[0005] To achieve the first objective of this utility model, the present utility model adopts the following technical solution:
[0006] An ultra-high-speed motor shaft includes an integrally formed shaft body, a support section, and a transmission section. The support section and the transmission section are located at both ends of the shaft body. Multiple recessed areas are uniformly arranged circumferentially on the side wall of the shaft body, and the periphery of the recessed areas transitions to the shaft body with an arc surface.
[0007] As a preferred embodiment, there are six recessed areas, which are equidistantly spaced along the circumference, and a support ridge is formed between adjacent recessed areas.
[0008] As a preferred embodiment, the recessed area and the supporting edge form an arc transition, and the width of the supporting edge is 1 / 3 to 1 / 2 of the width of the recessed area.
[0009] As a preferred embodiment, the recessed area is elongated, and the length of the recessed area is 90 to 95% of the shaft length.
[0010] As a preferred embodiment, the maximum inward concavity of the recessed area is 5% to 15% of the shaft diameter.
[0011] As a preferred embodiment, the end of the shaft body and the recessed area also form an arc transition, and a flared end is provided between the shaft body and the support section and / or transmission section. The flared end, the end of the shaft body, and the end of the recessed area of the shaft body together form a triangular support end.
[0012] To achieve the second objective mentioned above, this utility model adopts the following technical solution:
[0013] A rotor includes a shaft and a rotor core, the rotor core being sleeved on the shaft and having an interference fit with the shaft, the shaft being an ultra-high speed motor shaft as described in any of the above.
[0014] As a preferred embodiment, the rotating shaft is further fitted with pressure rings, and the two pressure rings abut against the two ends of the rotor core respectively. The interference fit between the pressure rings and the rotating shaft is greater than the interference fit between the rotor core and the rotating shaft.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] The motor shaft of this invention has multiple recessed areas on the shaft body. These recessed areas are designed to allow for radial deformation. Under high speed conditions, centrifugal force causes deformation, and the recessed areas expand outward, dynamically compensating for the lost interference as the rotational speed changes. Compared to a pure circular shaft structure, the initial pressing force of the motor shaft of this invention is reduced by more than 20%. Furthermore, motors using the motor shaft structure of this invention can increase their rotational speed to over 25,000 rpm. Attached Figure Description
[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.
[0018] Figure 1 This is a schematic diagram of the overall structure of the motor shaft of this utility model;
[0019] Figure 2 This is a cross-sectional structural diagram of the motor shaft of this utility model (cut at the support edge).
[0020] Figure 3 This is a cross-sectional structural diagram of the motor shaft of this utility model (cut at the recessed area).
[0021] Figure 4 This is a schematic diagram of the rotor structure of this utility model;
[0022] Figure 5 This is a schematic diagram of the rotor cross-sectional structure of this utility model.
[0023] The attached figures are labeled as follows: 1. Shaft body; 2. Support section; 3. Transmission section; 31. Spline tooth; 11. Recessed area; 12. Support ridge; 13. Support end; 100. Rotating shaft; 200. Rotor core; 300. Pressure ring. Detailed Implementation
[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0026] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.
[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0031] like Figures 1 to 3 As shown, an ultra-high speed motor shaft includes an integrally formed shaft body 1, a support section 2, and a transmission section 3. The support section 2 and the transmission section 3 are located at both ends of the shaft body 1, and the outer side wall of the transmission section 3 is also provided with spline teeth 31. Multiple recessed areas 11 are uniformly arranged circumferentially on the side wall of the shaft body 1, and the periphery of the recessed areas 11 and the shaft body 1 are all arc-shaped transitions.
[0032] In the aforementioned structure, the recessed area expands outward due to centrifugal force during high-speed rotation, compensating for the interference loss between the rotor core and the shaft caused by centrifugal force, thus achieving adaptive interference compensation with rotational speed. Simultaneously, the recessed area provides radial deformation space during initial assembly, reducing pressing force by more than 20% and resolving assembly difficulties caused by large interference. Furthermore, designing the connection between the recessed area and the shaft as a curved transition structure reduces surface scratches during assembly, avoids metal shavings residue, and significantly improves cleanliness.
[0033] The six recessed regions 11 are equidistant from each other along the circumference, and a support ridge 12 is formed between adjacent recessed regions 11. The use of six symmetrical recessed regions in this structure ensures uniform distribution of centrifugal force during high-speed rotation, avoiding vibration imbalance. Simultaneously, the support ridge acts as a rigid frame, maintaining the overall strength of the shaft and preventing excessive deformation of the recessed regions.
[0034] As a further optimization, the recessed area 11 and the supporting edge 12 form an arc-shaped transition, and the width of the supporting edge is 1 / 3 to 1 / 2 of the width of the recessed area. The arc-shaped transition in the above structure eliminates stress concentration points and improves fatigue life. The proportion of the supporting edge width ensures that the expansion of the recessed area is controllable, balancing compensation capability and structural stability.
[0035] The recessed region 11 is elongated, with a length of 90-95% of the shaft body length 1. The elongated recess covers the rotor core mating area, ensuring full-area dynamic compensation. The maximum inward concavity of the recessed region 11 is 5%-15% of the shaft body diameter. The concavity depth of the recessed region balances the compensation requirements with the shaft rigidity, avoiding excessive weakening of strength.
[0036] The end of the shaft body 1 and the recessed area 11 also form an arc transition, and a flared end is provided between the shaft body 1 and the support section 2 and / or the transmission section 3. The flared end, the end of the shaft body 1, and the end of the recessed area 11 of the shaft body 1 together form a triangular support end 13. The flared end in the above structure serves as a guide slope to guide the rotor core to be smoothly pressed in, reducing assembly damage. At the same time, the triangular support end enhances the end rigidity and prevents axial displacement of the core at high speeds.
[0037] like Figure 4 and Figure 5 As shown, a rotor includes a shaft 100 and a rotor core 200. The rotor core 200 is sleeved on the shaft 100 and is interference-fitted with the shaft 100. The shaft 100 is an ultra-high-speed motor shaft as described above. Two pressure rings 300 are also interference-fitted onto the shaft 100, with the two pressure rings 300 abutting against both ends of the rotor core 200. The interference fit between the pressure rings 300 and the shaft 100 is greater than the interference fit between the rotor core 200 and the shaft 100. The pressure rings provide greater axial preload to prevent high-speed movement of the core. As a "safety valve," the pressure rings preferentially maintain axial positioning under extreme operating conditions, protecting the core body.
[0038] In summary, the motor shaft of this utility model not only solves the assembly process problem, but also significantly increases the motor speed.
[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims
1. A high-speed motor shaft, comprising an integrally formed shaft body (1), a support section (2), and a transmission section (3), wherein the support section (2) and the transmission section (3) are respectively located at both ends of the shaft body (1), characterized in that, Multiple recessed areas (11) are uniformly arranged circumferentially on the side wall of the shaft (1), and the four sides of the recessed areas (11) are all arc-shaped transitions with the shaft (1).
2. The ultra-high-speed motor shaft according to claim 1, characterized in that, There are six recessed areas (11), which are equidistant from each other along the circumference, and a support ridge (12) is formed between adjacent recessed areas (11).
3. The ultra-high-speed motor shaft according to claim 2, characterized in that, The recessed area (11) and the supporting edge (12) are connected by an arc surface, and the width of the supporting edge is 1 / 3 to 1 / 2 of the width of the recessed area.
4. The ultra-high-speed motor shaft according to claim 1, characterized in that, The recessed area (11) is elongated, and the length of the recessed area (11) is 90 to 95% of the length of the shaft (1).
5. The ultra-high-speed motor shaft according to claim 1, characterized in that, The maximum inward concavity of the recessed area (11) is 5% to 15% of the shaft diameter.
6. The ultra-high-speed motor shaft according to claim 1, characterized in that, The end of the shaft (1) and the recessed area (11) are also arc-shaped transitions, and a flared end is provided between the shaft (1) and the support section (2) and / or the transmission section (3). The flared end, the end of the shaft (1) and the end of the recessed area (11) of the shaft (1) together form a triangular support end (13).
7. A rotor comprising a shaft (100) and a rotor core (200), the rotor core (200) being sleeved on the shaft (100) and having an interference fit with the shaft (100), characterized in that: The rotating shaft (100) is an ultra-high speed motor shaft as described in any one of claims 1 to 6.
8. A rotor according to claim 7, characterized in that, The shaft (100) is also fitted with a pressure ring (300), and the two pressure rings (300) abut against the two ends of the rotor core (200) respectively. The interference fit between the pressure ring (300) and the shaft (100) is greater than the interference fit between the rotor core (200) and the shaft (100).