A novel rotor shaft, rotor, and motor

Abstract

This utility model provides a novel rotor shaft, rotor, and motor, belonging to the field of motor technology. The rotor shaft includes a shaft body with multiple protrusions evenly distributed along the circumference of the shaft body on its outer wall; the cross-section of the protrusions gradually decreases from the center to the periphery of the shaft body. The shaft body also has fastening grooves, located near one end of a protrusion, or at either end opposite to the protrusion. This rotor shaft, through the design of the protrusions and fastening grooves, enhances the bonding force with the plastic-coated body, thereby improving the bonding force between the rotor shaft and the plastic-coated body, high torque transmission efficiency, and structural stability.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a novel rotor shaft, rotor, and motor. Background Technology

[0002] With the development of technology, various types of motor equipment are widely used. As a key component of the motor, the rotor's structural design has a crucial impact on the motor's performance and reliability. Plastic-coated rotors are a widely used structure in the motor field. Most common plastic-coated rotors on the market adopt a one-piece design of the rotor shell, plastic coating, and rotor shaft. The core of this traditional structure lies in the inclusion of an inner iron core, which is tightly connected to the rotor shaft and iron core through an interference fit. This ensures high bonding force and torque transmission efficiency, thereby meeting the motor's operating requirements under different working conditions. However, with continuous technological development and innovation, coreless modular rotors have emerged as a new design concept. The significant feature of this rotor is that it completely abandons the traditional inner iron core structure; the rotor is fixed solely by plastic coating technology, directly connecting the rotor shaft to the shaft hole. This innovative design simplifies the rotor structure and reduces production costs to some extent, but it has also exposed some problems that urgently need to be solved in practical applications.

[0003] Due to the lack of an inner iron core for support, the fit between the rotor shaft and the shaft hole becomes a non-interference fit. This non-interference fit significantly reduces the contact area and friction between the rotor shaft and the shaft hole, thus affecting the overall structural stability. Under high-speed operation or heavy load conditions, the rotor may slip or shift, which not only reduces the motor's operating efficiency but may also lead to equipment failure or even safety accidents.

[0004] Therefore, it is necessary to improve the existing plastic-coated rotor to overcome the shortcomings of the existing technology. Utility Model Content

[0005] To overcome the problems existing in the related technologies, one of the objectives of this utility model is to provide a novel rotor shaft that can enhance the bonding force with the plastic-coated body through the design of protrusions and fastening grooves, thereby improving the bonding force between the rotor shaft and the plastic-coated body, high torque transmission efficiency, and structural stability.

[0006] A novel rotor shaft includes a shaft body, on which a plurality of protrusions are provided, the plurality of protrusions being evenly distributed along the circumference of the shaft body on the outer wall of the shaft body;

[0007] Along the direction from the center to the periphery of the shaft, the cross-section of the protrusion gradually decreases;

[0008] The shaft is also provided with a fastening groove, which is located near one end of the protrusion; or, located near the two opposite ends of the protrusion.

[0009] Specifically, the shaft body of this application can be made of any material selected from stainless steel, carbon steel, aluminum alloy, or engineering plastics. During the manufacturing process, the shaft body is first machined using a CNC lathe to ensure dimensional accuracy and surface quality. A custom-made knurling cutter is used to machine protrusions on the outer wall of the shaft body. By controlling the parameters of the knurling cutter, the size and shape of the protrusions are ensured to meet design requirements. Then, a fastening groove is machined on the shaft body according to design requirements; specifically, the transition area of ​​the fastening groove is treated with a radius of 0.2mm.

[0010] During the injection molding process of the rotor shaft, a PBT + 20% glass fiber composite material is filled into the protrusions and fastening grooves of the encapsulated body and the shaft body through injection molding, forming an integral interlocking and fixing structure. During the injection molding process, the material first fills the fastening groove at one end, and the injection molding structural parameters are controlled to control the injection molding effect, and finally solidification is completed in the fastening groove at one end.

[0011] The raised, serrated texture of the rotor shaft forms a multi-level micro-interlocking surface, providing higher friction when in contact with the plastic-coated material, thereby improving torque transmission efficiency. The fastening grooves form mechanical stops, increasing axial displacement resistance by 300% and significantly improving the structural stability of the rotor shaft. In summary, the design of the raised sections and fastening grooves creates a three-dimensional interlocking effect, further enhancing the radial and axial forces of the rotor shaft and improving torque transmission efficiency.

[0012] In a preferred embodiment of this invention, the cross-section of the protrusion is trapezoidal or V-shaped.

[0013] In one specific implementation, the widths of the upper and lower bases of the trapezoidal protrusion are 5%-7% and 8%-10% of the shaft diameter, respectively. This design increases the contact area between the protrusion and the plastic coating material, thereby improving the bonding force.

[0014] Alternatively, in a specific implementation, the V-shaped protrusion has a 60° apex angle, a 30° surface contact angle, a 40% increase in texture depth, a surface roughness Ra value of 3.2 μm, and an increased coefficient of friction of 0.25-0.35. These optimized parameters significantly increase the contact area between the V-shaped protrusion and the plastic-coated material, thereby improving the bonding strength.

[0015] The trapezoidal and V-shaped raised serrated patterns form a multi-level micro-interlocking surface, which can provide higher friction when in contact with the plastic-coated material, thereby improving torque transmission efficiency.

[0016] In a preferred embodiment of this invention, the cross-section of the protrusion is V-shaped, and the apex of the protrusion is set at an included angle A, wherein 45° < A < 60°.

[0017] In one specific implementation, the V-shaped raised serrated texture forms a multi-level micro-interlocking surface, which can provide higher friction when in contact with the plastic-coated material, thereby improving torque transmission efficiency.

[0018] By keeping the apex angle A of the protrusion within the range of 45° < A < 60°, this design further increases the contact area and friction between the protrusion and the plastic coating material, thereby significantly improving the bonding strength.

[0019] In a preferred embodiment of this invention, the contact angle between the protrusion and the surface of the shaft is set at an angle B, wherein 30° < B < 35°. The contact angle B between the protrusion and the shaft surface is within the range of 30° < B < 35°. This design further increases the contact area and friction between the protrusion and the plastic coating material, thereby significantly improving the bonding strength.

[0020] In a preferred embodiment of this invention, the surface of the protrusion is provided with anti-slip texture, and the surface roughness Ra of the protrusion is greater than 3.2 μm.

[0021] In this embodiment, the anti-slip texture is improved to further enhance friction and increase adhesion.

[0022] In a preferred embodiment of this utility model, a fastening groove is provided on the shaft, and the fastening groove is located near the two opposite ends of the protrusion.

[0023] Along the axial direction of the shaft, the minimum distance between the edge of the fastening groove and the protrusion is 1-2 mm.

[0024] The fastening grooves are located 1-2 mm axially at both ends of the V-shaped knurled structure, forming a "buckle"-like structure. Once the plastic coating material fills and solidifies within the fastening grooves, it acts as if mechanical stops are placed at both ends of the rotor shaft. These stops effectively prevent axial displacement of the rotor shaft, ensuring it remains in the correct position even under high-speed operation or large load variations. This significantly improves the axial stability of the rotor shaft, preventing mechanical failures and performance degradation caused by axial displacement.

[0025] During the filling process, the plastic-coated material can fully contact and solidify with the fastening grooves and protrusions. The solidified material forms a robust support structure within the fastening grooves, tightly bonding with the rotor shaft and the plastic-coated body, thereby significantly enhancing the rotor shaft's resistance to axial displacement. It is estimated that compared to traditional structures, the resistance to axial displacement can be effectively improved, greatly enhancing the reliability of the rotor shaft under complex operating conditions.

[0026] In a preferred embodiment of this invention, the depth of the fastening groove is d, and the diameter of the shaft is D, where d = 8%D - 10%D.

[0027] The groove depth is 8%-10% of the shaft diameter, and the groove width is in a 1:1.5 ratio to the knurling pitch. The transition area is rounded with a radius of 0.2mm. This precise dimensional and shape design helps optimize stress distribution. In traditional structures, stress concentration can easily lead to excessive stress in certain areas, causing material fatigue and damage. This design, through a reasonable groove depth, width ratio, and rounded transition, ensures that stress is evenly distributed in the fastening groove area, reducing stress concentration and thus extending the rotor shaft's service life and improving its reliability during long-term operation.

[0028] In a preferred embodiment of this invention, the width of the fastening groove is W1, and the pitch between two adjacent protrusions is W2, where W1:W2 = 1:1 to 1:1.5. Specifically, the pitch refers to the straight-line distance between the apex of one V-shaped knurling pattern and the apex of the next V-shaped knurling pattern.

[0029] The second objective of this utility model is to provide a rotor, including a housing and the novel rotor shaft described above;

[0030] The housing is disposed around the rotor shaft, and the housing and the rotor shaft are connected to each other by injection molding.

[0031] The third objective of this utility model is to provide an electric motor, including the rotor as described above.

[0032] This motor enhances the bond between the rotor shaft and the plastic-coated body through the design of protrusions and fastening grooves on the rotor shaft. By strengthening the bond and improving structural stability, the rotor shaft can maintain good performance under high-speed operation or heavy load conditions, thus improving the overall durability of the machine.

[0033] The beneficial effects of this utility model are as follows:

[0034] This invention provides a novel rotor shaft, comprising a shaft body with multiple protrusions evenly distributed along the circumference of the shaft body's outer wall. The cross-section of each protrusion gradually decreases from the center to the periphery of the shaft body. Fastening grooves are also provided on the shaft body, either near one end of a protrusion or at opposite ends. This rotor shaft can be used in plastic-coated rotors. In practical applications, the serrated texture of the V-shaped protrusions forms a multi-level micro-interlocking surface, providing higher friction when in contact with the plastic coating material, thereby improving torque transmission efficiency. The fastening grooves at both ends of the protrusions form mechanical stops, enhancing the shaft's resistance to axial displacement within the rotor and significantly improving the rotor shaft's structural stability. Through the design of the protrusions and fastening grooves, this rotor shaft creates a three-dimensional interlocking effect, further enhancing the radial and axial forces of the rotor shaft and improving torque transmission efficiency.

[0035] This application also provides a rotor including the above-mentioned novel rotor shaft and a motor. Through the design of the rotor shaft, the motor enhances the coupling force of the rotor shaft and improves the structural stability, so that the rotor shaft can still maintain good performance under high-speed operation or heavy load conditions, thereby improving the durability of the motor and the environmental adaptability of the whole machine. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the rotor shaft provided by this utility model;

[0037] Figure 2 This is a partial structural schematic diagram of the rotor shaft provided by this utility model;

[0038] Figure 3 This is a cross-sectional view of the protrusions provided by this utility model on the shaft.

[0039] Figure 4 This is a schematic diagram of the pitch between two adjacent protrusions provided by this utility model.

[0040] Figure label:

[0041] 1. Shaft; 11. Protrusion; 12. Fastening groove. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0043] Plastic-coated rotors are a widely used structure in the motor industry. Most commercially available plastic-coated rotors employ a one-piece design, integrating the rotor housing, plastic coating, and rotor shaft. The core of this traditional structure lies in the inclusion of an inner iron core, which is tightly bonded to the rotor shaft via an interference fit. This ensures high bonding force and torque transmission efficiency, meeting the motor's operational requirements under various conditions. However, with continuous technological development and innovation, coreless modular rotors have emerged as a new design concept. The significant characteristic of this type of rotor is the complete elimination of the traditional inner iron core structure; the rotor is fixed solely by directly connecting the rotor shaft to the shaft hole using plastic coating technology. This innovative design simplifies the rotor structure and reduces production costs to some extent, but it has also revealed some problems that urgently need to be addressed in practical applications.

[0044] Due to the lack of an inner iron core for support, the fit between the rotor shaft and the shaft hole becomes a non-interference fit. This non-interference fit significantly reduces the contact area and friction between the rotor shaft and the shaft hole, thus affecting the overall structural stability. Under high-speed operation or heavy load conditions, the rotor may slip or shift, which not only reduces the motor's operating efficiency but may also lead to equipment failure or even safety accidents.

[0045] Based on this, this application provides a novel rotor shaft.

[0046] Example 1

[0047] like Figures 1-4 As shown, this embodiment provides a novel rotor shaft, which includes a shaft body 1. The shaft body 1 is provided with a plurality of protrusions 11, which are evenly distributed along the circumference of the shaft body 1 on the outer wall of the shaft body 1.

[0048] Along the direction from the center to the periphery of the shaft 1, the cross-section of the protrusion 11 gradually decreases;

[0049] The shaft 1 is also provided with a fastening groove 12, which is located near one end of the protrusion 11; or, located near the two opposite ends of the protrusion 11.

[0050] Specifically, the shaft 1 of this application can be made of any material selected from stainless steel, carbon steel, aluminum alloy, or engineering plastics. During the manufacturing process, the shaft 1 is first machined using a CNC lathe to ensure its dimensional accuracy and surface quality. A protrusion 11 is then machined on the outer wall of the shaft 1 using a custom-made knurling cutter. By controlling the parameters of the knurling cutter, the size and shape of the protrusion 11 are ensured to meet the design requirements. Then, a fastening groove 12 is machined on the shaft 1 according to the design requirements. Specifically, the transition area of ​​the fastening groove 12 is rounded with a radius of 0.2mm.

[0051] During the injection molding process of the rotor shaft, a PBT + 20% glass fiber composite material is filled into the protrusions 11 and fastening grooves 12 of the encapsulated body and shaft body 1 through injection molding, forming an integral interlocking and fixing structure. During the injection molding process, the material preferentially fills the fastening groove 12 at one end, and the injection molding structural parameters are controlled to control the injection molding effect, and finally solidification is completed at the fastening groove 12 at one end.

[0052] The serrated texture of the protrusion 11 on the rotor shaft forms a multi-level micro-interlocking surface, which provides higher friction when in contact with the plastic-coated material, thereby improving torque transmission efficiency. The fastening groove 12 forms a mechanical stop, increasing the resistance to axial displacement by 300%, significantly improving the structural stability of the rotor shaft. In summary, the design of the protrusion 11 and the fastening groove 12 creates a three-dimensional interlocking effect, further enhancing the radial and axial forces of the rotor shaft and improving torque transmission efficiency.

[0053] Example 2

[0054] This embodiment is an improvement on embodiment 1.

[0055] like Figures 1-4 As shown, in this embodiment, the cross-section of the protrusion 11 is trapezoidal or V-shaped.

[0056] In this embodiment, the widths of the upper and lower bases of the trapezoidal protrusion 11 are 5%-7% and 8%-10% of the shaft diameter, respectively. This design increases the contact area between the protrusion 11 and the plastic coating material, thereby improving the bonding force.

[0057] Alternatively, in a specific embodiment, the V-shaped protrusion 11 has a apex angle of 60°, a surface contact angle of 30°, a texture depth increased by 40%, a surface roughness Ra value reaching 3.2 μm, and a friction coefficient increased to 0.25-0.35. These optimized parameters significantly increase the contact area between the V-shaped protrusion 11 and the plastic-coated material, thereby improving the bonding strength.

[0058] The serrated texture of the trapezoidal and V-shaped protrusions 11 forms a multi-level micro-interlocking surface, which can provide higher friction when in contact with the plastic-coated material, thereby improving the torque transmission efficiency.

[0059] Example 3

[0060] This embodiment is an improvement on embodiment 1.

[0061] like Figures 1-4 As shown, in this embodiment, the cross-section of the protrusion 11 is V-shaped, and the apex of the protrusion 11 is set at an included angle A, where 45° < A < 60°.

[0062] In practical applications, a custom-made knurling cutter is used to machine a V-shaped protrusion 11 on the outer wall of the shaft 1. By precisely controlling the parameters of the knurling cutter, the apex angle A of the protrusion 11 is ensured to be within the range of 45° < A < 60°, for example, it can be 50°, 55°, or 58°. At the same time, the surface contact angle is ensured to be 30°, the texture depth is increased by 40%, and the surface roughness Ra value reaches 3.2μm.

[0063] The serrated texture of the V-shaped protrusion 11 forms a multi-level micro-interlocking surface, which can provide higher friction when in contact with the plastic coating material, thereby improving the torque transmission efficiency.

[0064] By keeping the apex angle A of the protrusion 11 within the range of 45° < A < 60°, this design further increases the contact area and friction between the protrusion 11 and the plastic coating material, thereby significantly improving the bonding force.

[0065] Example 4

[0066] This embodiment is an improvement on embodiment 1.

[0067] like Figures 1-4 As shown, in this embodiment, the protrusion 11 is set at an angle B with the surface contact angle of the shaft 1, wherein 30° < B < 35°.

[0068] In this embodiment, a V-shaped protrusion 11 is machined on the outer wall of the shaft 1 using a custom knurling cutter. By precisely controlling the parameters of the knurling cutter, the apex angle of the protrusion 11 is ensured to be 60°, and the contact angle B is within the range of 30° < B < 35°, for example, 32°, 33°, or 34°. Simultaneously, the anti-slip texture ensures a 40% increase in texture depth and a surface roughness Ra value of 3.2 μm. The contact angle B between the protrusion 11 and the surface of the shaft 1 is within the range of 30° < B < 35°. This design further increases the contact area and friction between the protrusion 11 and the plastic coating material, thereby significantly improving the bonding strength.

[0069] Example 5

[0070] This embodiment is an improvement on embodiment 4.

[0071] like Figures 1-4 As shown, in this embodiment, the surface of the protrusion 11 is provided with anti-slip texture, and the surface roughness Ra of the protrusion 11 is greater than 3.2μm.

[0072] In this embodiment, a PBT + 20% glass fiber composite material is used for injection molding when the rotor shaft is joined to the plastic-coated body. Under pressure plastic coating conditions, the solid material preferentially fills the lower fastening groove 12 at a filling rate of 120 mm. 3 The material spirals upwards along the V-shaped groove at a rate of 55°, finally solidifying at the upper fastening groove 12. The solidified material forms approximately 85% contact area with the sidewall of the V-shaped groove, and the circular fastening grooves 12 at both ends form mechanical stops, enhancing the rotor's bonding force and torque through a three-dimensional interlocking effect. Simultaneously, the anti-slip texture on the surface of the protrusion 11 further enhances the friction with the plastic-coated body, improving the bonding force.

[0073] The surface roughness Ra of the protrusion is greater than 3.2 μm. This higher surface roughness makes the surface of protrusion 11 more rough, thereby increasing the friction between it and the plastic-coated body. When the rotor shaft is engaged with the plastic-coated body, this increased friction can more effectively prevent relative slippage between the two, further improving the engagement force and stability of the rotor shaft.

[0074] The anti-slip textured design on the raised 11 surface further enhances friction. The texture of the anti-slip pattern allows for a tighter engagement with the plastic-coated body, increasing the contact area and coefficient of friction between them. This design ensures a more secure bond between the rotor shaft and the plastic-coated body under high-speed operation or large load variations, further reducing the risk of slippage.

[0075] In a more specific embodiment, the anti-slip texture employs a cross-cutting pattern with the lines intersecting at a 45° angle. This cross-cutting design provides excellent anti-slip performance in multiple directions, enhancing friction with the coated material. The anti-slip texture depth is 0.5mm, ensuring that the coated material fully fills the texture during injection molding, forming a good interlock. The texture spacing is 1.5mm, guaranteeing sufficient friction without compromising the filling effect of the coated material due to overly dense textures.

[0076] Example 6

[0077] This embodiment is an improvement on embodiment 1.

[0078] like Figures 1-4 As shown, in this embodiment, a fastening groove 12 is provided on the shaft 1, and the fastening groove 12 is provided near the two opposite ends of the protrusion 11.

[0079] Along the axial direction of the shaft 1, the minimum distance between the edge of the fastening groove 12 and the protrusion 11 is 1-2 mm. This design ensures that the plastic coating material fully fills the fastening groove 12 during injection molding, forming upper and lower limit fixation and further enhancing the bonding force.

[0080] Furthermore, in this embodiment, the depth of the fastening groove 12 is d, and the diameter of the shaft 1 is D, where d = 8%D - 10%D.

[0081] In this embodiment, the width of the fastening groove 12 is W1, and the pitch between two adjacent protrusions 11 is W2, where W1:W2 = 1:1-1:1.5.

[0082] Specifically, a fastening groove 12 is provided on the shaft 1, located near one end of the protrusion 11 or at either end opposite to the protrusion 11. The groove depth of the fastening groove 12 is 8%-10% of the shaft diameter, and the groove width is in a 1:1.5 ratio to the pitch of the protrusion 11. The transition area is treated with a 0.2mm radius to reduce stress concentration. This precise dimensional and shape design helps optimize stress distribution. In traditional structures, stress concentration can easily lead to excessive stress in certain areas, resulting in material fatigue and damage. This design, through a reasonable groove depth, groove width ratio, and rounded transition, ensures that stress is evenly distributed in the fastening groove 12 area, reducing stress concentration and thus extending the service life of the rotor shaft and improving its reliability during long-term operation.

[0083] In actual production, a PBT + 20% glass fiber composite material is injected into the protrusions 11 and the fastening grooves 12 to form an integral interlocking structure. During the injection molding process, the material preferentially fills the lower fastening groove 12 at a filling rate of 120mm. 3 / s, spiraling upwards along the V-shaped groove at an angle of 55°, and finally solidifying at the upper fastening groove 12.

[0084] The depth d of the fastening groove 12 is 8%-10% of the shaft diameter D, and the width W1 is in a ratio of 1:1 to 1:1.5 with the pitch W2 between two adjacent protrusions 11. This design can ensure that the plastic coating material fully fills the fastening groove 12 during the injection molding process, forming upper and lower limit fixation, and further enhancing the bonding force.

[0085] Example 7

[0086] This embodiment provides a rotor, including a housing and the novel rotor shaft described above;

[0087] like Figures 1-4 As shown, the housing is disposed around the rotor shaft, and the housing and the rotor shaft are connected to each other by injection molding.

[0088] This rotor can be applied to coreless modular rotors. Through the optimized design of the V-shaped protrusions 11, anti-slip textures, and fastening grooves 12, the bonding force between the rotor shaft and the plastic-coated body is significantly enhanced, improving the overall quality and performance of the rotor.

[0089] In practical applications, the rotor shaft protrusion 11 adopts a V-shaped design with a 60° apex angle and an optimized surface contact angle of 30°, forming a multi-level micro-engagement surface. The texture depth is increased by 40%, and the surface roughness Ra value can reach 3.2μm. Anti-slip textures are provided on the surface of the V-shaped protrusion 11. The anti-slip textures adopt a cross-diagonal texture design with a cross angle of 45°, a texture depth of 0.5mm, and a texture spacing of 1.5mm.

[0090] At 1mm from both ends of the V-shaped protrusion 11, circular fastening grooves 12 are respectively provided along the axis of the shaft. The groove depth of the fastening groove 12 is 8%-10% of the shaft diameter, the groove width is in a 1:1.5 ratio with the knurling pitch, and the transition area is treated with a radius of 0.2mm to reduce stress concentration.

[0091] The housing is made of high-strength plastic material, such as a PBT + 20% glass fiber composite, which has good mechanical properties and high-temperature resistance. During injection molding, the PBT + 20% glass fiber composite is injected into the gap between the housing and the rotor shaft at a filling rate of 120mm. 3 / s. Under the action of pressure and temperature, the material preferentially fills the lower fastening groove 12, spirals up along the anti-slip texture of the V-shaped protrusion 11, and finally solidifies in the upper fastening groove 12.

[0092] The combination of the V-shaped protrusions 11 and the anti-slip texture significantly increases the friction between the rotor shaft and the plastic-coated body. The cross-shaped diagonal design of the anti-slip texture provides excellent anti-slip effect in multiple directions, further enhancing the engagement with the plastic-coated body. This design ensures a more secure connection between the rotor shaft and the plastic-coated body under high-speed operation or large load variations, effectively preventing slippage. The fastening grooves 12 further enhance the bonding force between the rotor shaft and the plastic-coated body. During the filling process, the plastic-coated material preferentially fills the fastening grooves 12, forming a mechanical stop and enhancing axial fixation. Through the three-dimensional interlocking effect, the bonding force and torque transmission efficiency of the rotor shaft are further improved.

[0093] Example 8

[0094] This embodiment provides an electric motor, including the rotor described above.

[0095] like Figures 1-4 As shown, the motor enhances the bonding force between the rotor shaft and the plastic-coated body through the design of the protrusion 11 and the fastening groove 12 on the rotor shaft. By enhancing the bonding force and improving structural stability, the rotor shaft can maintain good performance under high-speed operation or heavy load conditions, thus improving the overall durability of the machine.

[0096] The rotor of the motor in this embodiment adopts the novel rotor shaft structure described above, including a V-shaped protrusion 11 and a fastening groove 12. The surface of the protrusion 11 of the rotor shaft is provided with anti-slip texture, and the surface roughness Ra is greater than 3.2μm, which significantly enhances the friction between it and the plastic-coated body. The stator of the motor adopts a traditional slot wedge structure, which fits tightly with the rotor to ensure the high-efficiency operation of the motor. The motor housing is made of high-strength aluminum alloy material, which has good heat dissipation performance and mechanical strength.

[0097] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0098] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0099] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A novel rotor shaft, comprising a shaft body (1), characterized in that: The shaft (1) is provided with a plurality of protrusions (11), and the plurality of protrusions (11) are evenly distributed along the circumference of the shaft (1) on the outer wall of the shaft (1); Along the direction from the center to the periphery of the shaft (1), the cross-section of the protrusion (11) gradually decreases; The shaft (1) is also provided with a fastening groove (12), which is located near one end of the protrusion (11); or, located at the two opposite ends of the protrusion (11).

2. The novel rotor shaft according to claim 1, characterized in that: The cross-section of the protrusion (11) is trapezoidal or V-shaped.

3. The novel rotor shaft according to claim 1, characterized in that: The cross-section of the protrusion (11) is V-shaped, and the apex of the protrusion (11) is set at an included angle A, wherein 45° < A < 60°.

4. The novel rotor shaft according to claim 3, characterized in that: The protrusion (11) is set at an angle B with the surface contact angle of the shaft (1), wherein 30° < B < 35°.

5. The novel rotor shaft according to any one of claims 1-4, characterized in that: The surface of the protrusion (11) is provided with anti-slip texture, and the surface roughness Ra of the protrusion (11) is greater than 3.2 μm.

6. The novel rotor shaft according to any one of claims 1-4, characterized in that: The fastening groove (12) of the shaft (1) is provided near the two opposite ends of the protrusion (11); Along the axial direction of the shaft (1), the minimum distance between the edge of the fastening groove (12) and the protrusion (11) is 1-2 mm.

7. The novel rotor shaft according to claim 6, characterized in that: The depth of the fastening groove (12) is d, and the diameter of the shaft (1) is D, where d = 8%D to 10%D.

8. The novel rotor shaft according to claim 6, characterized in that: The width of the fastening groove (12) is W1, and the pitch between two adjacent protrusions (11) is W2, where W1:W2 = 1:1-1:1.

5.

9. A rotor, characterized in that: Includes a housing and a novel rotor shaft as described in any one of claims 1-8; The housing is disposed around the novel rotor shaft, and the housing and the novel rotor shaft are connected to each other by injection molding.

10. An electric motor, characterized in that: Includes the rotor as described in claim 9.

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