Stator punching sheet assembly, stator core and motor

Abstract

The invention provides a stator punching sheet assembly, a stator core and a motor. The stator punching sheet assembly comprises a punching sheet body and a vibration damping structure. The punching sheet body comprises a yoke part and tooth parts, and the radial inner side of the yoke part is provided with a plurality of tooth parts at intervals; the vibration reduction structure comprises a reflection groove and an outer vibration reduction layer, the reflection groove is formed in the yoke part, and the reflection groove is located on a transmission path of an electromagnetic force wave in the tooth part; an outer vibration reduction layer is arranged on the radial outer side of the yoke part, the reflection groove is used for weakening a part of electromagnetic force waves, and the outer vibration reduction layer is used for weakening the remaining part of electromagnetic force waves. According to the invention, the reflection groove and the outer vibration reduction layer are arranged at the same time, the reflection groove reflects part of electromagnetic force waves back to the tooth part and counteracts the electromagnetic force waves on the adjacent tooth part in a hedging manner, and the residual electromagnetic force waves are still transmitted out from the yoke part, so that the vibration caused by the electromagnetic force waves can be more effectively reduced through the multi-stage weakening mode, and the vibration reduction effect is improved. And the operation stability of the motor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a stator punching assembly, a stator core and a motor. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) are widely used in fans, electric vehicles, and other fields due to their high efficiency, power, and fast dynamic response. However, during operation, the motors may generate electromagnetic vibrations, which can affect their performance and service life.

[0003] There are many reasons for electromagnetic vibration, such as abnormal vibration caused by uneven distribution of the air gap magnetic field and the presence of harmonic magnetic fields. Currently, the commonly used vibration reduction methods include: using segmented slot settings, stator slot or rotor slot magnetic pole tilting structures, etc. to reduce the impact of electromagnetic vibration on the motor, or using a vibration-damping rotor structure. Although changing the stator and rotor slot structure can significantly reduce the cogging torque and reduce motor vibration, these structures are difficult to manufacture and increase processing costs. Although the use of a vibration-damping rotor structure will improve the motor vibration, the radial length of the built-in rotor magnet is limited, and the amount of motor magnets used is reduced, which will lead to a decrease in the rotor power density. The rotor is also prone to jumping or falling off, resulting in a decrease in motor reliability. Summary of the Invention

[0004] The present invention provides a stator punching sheet assembly, a stator core and a motor, which can solve the technical problem that although changing the stator and rotor slot structure can significantly reduce the slot torque and reduce the vibration of the motor, the radial length of the magnetic steel is limited, the amount of motor magnetic steel used is reduced, and the rotor power density is reduced.

[0005] The present invention provides a stator punching sheet assembly, which includes a punching sheet body and a vibration damping structure; The punching plate body includes a yoke portion and a tooth portion, and a plurality of the tooth portions are arranged at intervals on the radial inner side of the yoke portion; The vibration damping structure includes a reflection groove and an outer vibration damping layer. The reflection groove is arranged on the yoke and is located on the transmission path of the electromagnetic force wave in the tooth portion; the outer vibration damping layer is arranged on the radial outer side of the yoke. The reflection groove is used to weaken a part of the electromagnetic force wave, and the outer vibration damping layer is used to weaken the remaining part of the electromagnetic force wave.

[0006] In some embodiments, the vibration damping structure further includes a positioning groove, wherein in the radial direction of the yoke, one end of the positioning groove is connected to the reflecting groove, and the other end of the positioning groove extends toward the outer peripheral wall of the yoke.

[0007] In some embodiments, a first inner vibration damping layer is provided in the positioning groove, a first end of the first inner vibration damping layer extends toward the reflecting groove, and a second end of the first inner vibration damping layer is connected to the outer vibration damping layer.

[0008] In some embodiments, a second inner vibration-damping layer is provided in the reflective groove, and a first end of the first inner vibration-damping layer is connected to the second inner vibration-damping layer.

[0009] In some embodiments, the outer vibration damping layer, the first inner vibration damping layer, and the second inner vibration damping layer are integrally formed.

[0010] In some embodiments, the outer vibration damping layer, the first inner vibration damping layer, and the second inner vibration damping layer are integrally formed by filling with a reflective material, and the material strength of the reflective material is greater than the material strength of the yoke.

[0011] In some embodiments, the reflective groove is V-shaped, the opening of the reflective groove faces the radial outside of the yoke, and a reflective groove is provided at the vertex of the reflective groove.

[0012] In some embodiments, the reflective groove is arc-shaped, the diameter of the reflective arc is d, the value range of the diameter d is 0.5mm~1.5mm, the angle of the reflective groove is α, and the value range of the angle α is 30°~90°.

[0013] A stator core comprises a stator punching sheet assembly, wherein the stator punching sheet assembly is the above-mentioned stator punching sheet assembly.

[0014] A motor includes a stator core, wherein the stator core is the stator core described above.

[0015] The present invention provides a stator punching assembly, a stator core, and a motor, which have the following beneficial effects: The present invention is provided with a reflection groove and an outer vibration damping layer at the same time. The reflection groove reflects part of the electromagnetic force wave back to the tooth portion and offsets the electromagnetic force wave on the adjacent tooth portion, thereby preliminarily weakening the energy of the electromagnetic force wave. There is still a remaining electromagnetic force wave transmitted from the yoke portion. At this time, the outer vibration damping layer is arranged on the radial outer side of the yoke portion. When the electromagnetic force wave propagates to the outer vibration damping layer, the outer vibration damping layer further weakens the remaining part of the electromagnetic force wave, further reducing the intensity of the electromagnetic force wave. Through this multi-stage weakening method, the vibration caused by the electromagnetic force wave can be more effectively reduced, and the smoothness of the motor operation can be improved. Although the reflection groove can weaken and offset the electromagnetic force wave to a certain extent, it may not be able to completely eliminate all electromagnetic force waves. The outer vibration damping layer can further process the remaining electromagnetic force waves that the reflection groove fails to weaken, make up for the lack of the vibration damping effect of the reflection groove, and thus achieve a more comprehensive vibration damping effect. The reflective trough and the outer vibration damping layer together constitute a multi-stage vibration damping system. Under different operating conditions, the intensity and frequency of the electromagnetic force wave may vary. This multi-stage vibration damping method can improve the stability and reliability of the vibration damping effect, ensuring that the motor can maintain good vibration damping performance under various operating conditions. In addition, relying solely on one structure of the reflective trough or the outer vibration damping layer may not meet the vibration damping requirements in some cases. Setting both at the same time can reduce dependence on a single vibration damping structure. Even if the vibration damping effect of one structure decreases due to certain factors, the other structure can still continue to play a role, maintaining the overall vibration damping effect and reducing dependence on a single structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0017] Figure 1 Schematic diagram of the influence of electromagnetic force waves on a stator punching assembly in the prior art; Figure 2 Schematic diagram of a stator punching assembly according to an embodiment of the present invention; Figure 3 Schematic diagram of a reflective groove and a positioning groove according to an embodiment of the present invention; Figure 4 for Figure 2 Enlarged view of point A in the middle; Figure 5 Schematic diagram of the influence of electromagnetic force waves on a stator punching assembly according to an embodiment of the present invention; Figure 6 This is an enlarged schematic diagram of the influence of electromagnetic force waves on the stator punching assembly according to an embodiment of the present invention.

[0018] Figure: 1-yoke; 2-tooth; 3-reflection groove; 301-second inner vibration damping layer; 302-reflection groove; 4-outer vibration damping layer; 5-positioning groove; 501-first inner vibration damping layer; 511-first end of the first inner vibration damping layer; 512-second end of the first inner vibration damping layer. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0021] For ease of description, spatially relative terms such as "on," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in a drawing is inverted, a device described as "above" or "on top of" the other devices or features would then be positioned "below" or "beneath" the other devices or features.

[0022] See also Figure 2As shown, according to an embodiment of the present invention, a stator punching sheet assembly is provided, including a punching sheet body and a vibration damping structure, the punching sheet body includes a yoke 1 and a tooth portion 2; a plurality of tooth portions 2 are arranged at intervals on the radial inner side of the yoke 1; the vibration damping structure includes a reflection groove 3 and a vibration damping layer, the reflection groove 3 is arranged on the yoke 1, and the reflection groove 3 is located on the transmission path of the electromagnetic force wave in the tooth portion 2; an outer vibration damping layer 4 is provided on the radial outer side of the yoke 1, the reflection groove 3 is used to weaken a part of the electromagnetic force wave, and the outer vibration damping layer 4 is used to weaken the remaining part of the electromagnetic force wave.

[0023] It is worth mentioning that Figure 1 As shown, in a permanent magnet synchronous motor, a magnetic field is generated when the stator winding is energized, which interacts with the magnetic field of the permanent magnet to generate electromagnetic torque to drive the motor. Due to factors such as uneven distribution of the air gap magnetic field and harmonic magnetic fields, additional electromagnetic force waves are generated. These electromagnetic force waves not only affect the smooth operation of the motor, but also cause vibration and noise. After the electromagnetic force wave is generated from the air gap, it will be transmitted along the radial direction of the punch body, that is, the stator tooth 2 and the yoke 1. The stator tooth 2 is one of the main propagation paths of the electromagnetic force wave. Because the tooth 2 is a magnetic field concentration area, the electromagnetic force wave will produce a large stress concentration in the tooth 2. When the electromagnetic force wave propagates in the tooth 2, it will propagate along the longitudinal and transverse directions of the tooth 2 and eventually be transmitted to the yoke 1. The yoke 1, as the support structure of the stator, will further transmit the electromagnetic force wave to the motor housing. In addition, this embodiment is preferably applicable to a built-in rotor structure.

[0024] Specifically, based on the transmission and reflection characteristics of waves, the principle of barrier vibration isolation is adopted to weaken the electromagnetic vibration of the motor. Barrier vibration isolation refers to a method of setting a barrier in the transmission path of noise from the source to the receiver to reduce vibration. In this embodiment, a reflection groove 3 is provided on the yoke 1. The reflection groove 3 is provided on the yoke 1 and is located on the transmission path of the electromagnetic force wave in the tooth 2. The main function of the electromagnetic force wave is to weaken a part of the electromagnetic force wave by changing the propagation path and phase of the electromagnetic force wave. When the electromagnetic force wave is transmitted from the tooth 2 to the reflection groove 3, the reflection groove 3 reflects part of the electromagnetic force wave to transmit along the circumferential direction of the yoke 1, and offsets the electromagnetic force wave on the adjacent tooth 2, but there is still a remaining electromagnetic force wave transmitted from the yoke 1. The outer vibration damping layer 4 is provided on the radial outside of the yoke 1. When the electromagnetic force wave propagates to the outer vibration damping layer 4, the outer vibration damping layer 4 further weakens the remaining part of the electromagnetic force wave.

[0025] In this embodiment, the presence of the reflection groove 3 causes the electromagnetic force wave to encounter a physical obstacle during its propagation. When the electromagnetic force wave is transmitted from the tooth portion 2 to the yoke portion 1, the reflection groove 3 blocks its original propagation path, preventing the electromagnetic force wave from continuing to spread outward along the original path. The reflection groove 3 reflects a portion of the electromagnetic force wave back to the area where the adjacent tooth portion 2 is located, changing its propagation direction. The electromagnetic force wave reflected back by the reflection groove 3 meets the electromagnetic force wave that is still propagating normally in the adjacent tooth portion 2 or the electromagnetic force wave reflected by the adjacent reflection groove 3. Due to the difference in phase between the two, when they meet, a counter-attack phenomenon will occur, that is, they interfere with each other and cancel out part of the energy. Through counter-attack, the energy of the electromagnetic force wave is effectively reduced, thereby reducing the intensity of the electromagnetic vibration. The reflection groove 3 first weakens a portion of the electromagnetic force wave, so that the energy of the electromagnetic force wave propagating to the outer vibration damping layer 4 is greatly reduced. This is equivalent to setting up a line of defense before the outer vibration damping layer 4, preliminarily intercepting and weakening the electromagnetic force wave, and reducing the vibration response pressure faced by the outer vibration damping layer 4. In this embodiment, the outer vibration damping layer 4 is arranged on the radially outer side of the yoke 1, which plays a role of physical isolation. The outer vibration damping layer 4 isolates the vibration inside the stator from the external structure, preventing the vibration from being directly transmitted to the motor housing or other connected components through the yoke 1. By absorbing the residual electromagnetic force wave energy, the outer vibration damping layer 4 can significantly reduce the vibration amplitude of the motor stator, which helps to reduce the vibration and noise generated by the motor during operation and improve the smoothness and quietness of the motor operation. On the other hand, if a vibration damping structure is provided on the rotor structure, since the vibration damping layer is added on the outside of the rotor shaft hole, the radial length of the built-in rotor magnet is limited, and the amount of motor magnet is reduced. In this embodiment, a vibration damping structure is provided on the stator structure, which can solve the problem of reducing the amount of magnet compared to the vibration damping rotor structure.

[0026] In this embodiment, both a reflective groove 3 and an outer vibration-damping layer 4 are provided. The reflective groove 3 reflects a portion of the electromagnetic force wave back to the tooth 2, where it counteracts the electromagnetic force wave on the adjacent tooth 2, thereby initially weakening the electromagnetic force wave's energy. However, some electromagnetic force wave still propagates from the yoke 1. In this case, the outer vibration-damping layer 4 is positioned radially outward from the yoke 1. When the electromagnetic force wave propagates to the outer vibration-damping layer 4, it further weakens the remaining electromagnetic force wave, further reducing its intensity. The outer vibration-damping layer 4 further enhances the vibration-damping effect by further absorbing or rebounding (depending on the filling material) the radial force wave from the stator yoke 1. The reflective groove 3 and the outer vibration-damping layer 4 work together to maximize vibration reduction. This multi-stage attenuation approach effectively reduces vibration caused by the electromagnetic force wave and improves the smoothness of the motor's operation. Although the reflection trough 3 can weaken and offset the electromagnetic force waves to a certain extent, the degree of weakening is limited. The outer vibration damping layer 4 can further process the remaining electromagnetic force waves that the reflection trough 3 fails to weaken, making up for the insufficient vibration damping effect of the reflection trough 3, thereby achieving a more comprehensive vibration damping effect. The reflection trough 3 and the outer vibration damping layer 4 together constitute a multi-stage vibration damping system. Under different operating conditions, the intensity and frequency of the electromagnetic force waves may vary. This multi-stage vibration damping method can improve the stability and reliability of the vibration damping effect, ensuring that the motor can maintain good vibration damping performance under various operating conditions. In addition, relying solely on one structure of the reflection trough 3 or the outer vibration damping layer 4 may not be able to meet the vibration damping requirements in some cases. Setting both at the same time can reduce dependence on a single vibration damping structure. Even if the vibration damping effect of one structure decreases due to certain factors, the other structure can still continue to play a role, maintaining the overall vibration damping effect and reducing dependence on a single structure.

[0027] It is worth noting that in this embodiment, a plurality of teeth 2 are provided on the radial inner side of the yoke 1. According to specific vibration reduction requirements, a reflection groove 3 can be provided on the transmission path of the electromagnetic force wave in each tooth 2. Preferably, the reflection groove 3 is provided on the extension line of the radial geometric center line of the tooth, or on one of the adjacent tooth 2. In this embodiment, preferably, each tooth 2 is provided with a corresponding reflection groove 3, and the reflection groove 3 is provided on the radial outer side of the tooth 2, specifically in the extension direction of the geometric center line of the tooth 2. When each tooth 2 has a corresponding reflection groove 3, when one of the reflection grooves 3 reflects the electromagnetic force wave and transmits it counterclockwise in the circumferential direction, the electromagnetic force wave reflected by the adjacent reflection groove 3 is transmitted clockwise, so that the two electromagnetic force waves meet and cancel each other out.

[0028] As a specific embodiment, since the electromagnetic force wave is transmitted in the circumferential direction of the punching body, the outer vibration damping layer 4 in this embodiment is annular. The outer vibration damping layer 4 can be a separate structure sleeved on the outer peripheral wall of the yoke 1. The outer vibration damping layer 4 can be molded on the outer peripheral wall of the yoke 1 by injection molding. In other embodiments, the outer vibration damping layer 4 can also be not annular, but can be arranged in a block-like manner on the radial outside of the yoke 1. The outer vibration damping layer 4 can locally reduce vibration.

[0029] See also Figures 2 to 6 As shown in the figure, the vibration reduction structure further includes a positioning groove 5 . In the radial direction of the yoke 1 , one end of the positioning groove 5 is connected to the reflection groove 3 , and the other end of the positioning groove 5 extends toward the outer peripheral wall of the yoke 1 .

[0030] Specifically, one end of the positioning groove 5 is connected to the reflection groove 3, and the other end extends toward the outer peripheral wall of the yoke 1, forming a specific guiding path. When the electromagnetic force wave propagates to the reflection groove 3, part of the electromagnetic force wave will be reflected back to the tooth 2 and offset the electromagnetic force wave of the adjacent tooth 2, while the other part of the electromagnetic force wave will enter the positioning groove 5 along the reflection groove 3. Under the guidance of the positioning groove 5, the electromagnetic force wave entering the positioning groove 5 propagates toward the outer peripheral wall along the path of the groove, which makes the electromagnetic force wave energy that was originally more concentrated to propagate toward the outside of the yoke 1 be dispersed to the area of ​​the positioning groove 5 and the outer vibration damping layer 4, changing the transmission direction and distribution of the electromagnetic force wave, avoiding excessive concentration of the electromagnetic force wave in a local area, and thus reducing the local vibration intensity.

[0031] In this embodiment, the reflective groove 3 and the positioning groove 5 play a positioning role for the outer vibration damping layer 4, preventing it from tangential sliding. The outer vibration damping layer 4 can further enhance the vibration damping effect and further absorb or rebound the radial force waves of the stator yoke 1. The reflective groove 3 and the outer vibration damping layer 4 work together to achieve maximum vibration reduction. The electromagnetic force wave forms multiple propagation paths between the reflective groove 3 and the positioning groove 5, increasing the chances of electromagnetic force waves interfering with and canceling each other. Electromagnetic force waves of different paths may have phase differences during propagation. When they meet, the mutual offset and cancellation effect is more obvious, thereby more effectively reducing the overall energy of the electromagnetic force wave. Because the positioning groove 5 is connected to the reflective groove 3, the reflective groove 3 can be brought closer to the tooth portion 2, improving the reflection ability. Compared with the structure with only the reflective groove 3, the positioning groove 5 plus the reflective groove 3 will reduce more core material, further changing the natural frequency of the motor and avoiding resonance with the fan blades and load.

[0032] See also Figures 2 to 6As shown in the figure, a first inner vibration-damping layer 501 is provided in the positioning groove 5. The first end 511 of the first inner vibration-damping layer 501 extends toward the reflecting groove 3. The end of the positioning groove 5 away from the reflecting groove 3 passes through the outer peripheral wall of the yoke 1. In this way, after the first inner vibration-damping layer 501 is provided in the positioning groove 5, the second end 512 of the first inner vibration-damping layer 501 is connected to the outer vibration-damping layer 4, forming an integral vibration-damping layer between the first inner vibration-damping layer 501 and the outer vibration-damping layer 4.

[0033] Specifically, when the electromagnetic force wave is transmitted from the tooth portion 2 to the reflection groove 3, the reflection groove 3 reflects part of the electromagnetic force wave back to the tooth portion 2, which offsets the electromagnetic force wave of the adjacent tooth portion 2, thereby weakening the energy of the electromagnetic force wave. Some electromagnetic force waves will still propagate toward the positioning groove 5 on one side of the reflection groove 3, and propagate along the positioning groove 5 toward the outer peripheral wall of the yoke 1. The electromagnetic force wave entering the positioning groove 5 encounters the first inner vibration damping layer 501, further weakening the energy of the electromagnetic force wave. The first end 511 of the first inner vibration damping layer 501 extends toward the reflection groove 3, and the second end 512 is connected to the outer vibration damping layer 4, which plays a guiding role and transmits the remaining electromagnetic force wave to the outer vibration damping layer 4. When the electromagnetic force wave propagates to the outer vibration damping layer 4, the outer vibration damping layer 4 again dissipates the remaining electromagnetic force wave energy, further reducing the intensity of the electromagnetic force wave.

[0034] In this embodiment, by absorbing the energy of the electromagnetic force wave, the first inner vibration damping layer 501 reduces the electromagnetic force wave energy transmitted from the positioning groove 5 to the outer vibration damping layer 4, reduces the vibration amplitude of the motor stator, and thereby reduces the vibration and noise during the operation of the motor. The first inner vibration damping layer 501 forms a guide path that guides the remaining electromagnetic force wave from the positioning groove 5 to the outer vibration damping layer 4, ensuring that the electromagnetic force wave can be smoothly transmitted to the outer vibration damping layer 4. This guiding effect makes the electromagnetic force wave more orderly during the propagation process, avoids the disordered reflection and scattering of the electromagnetic force wave between the positioning groove 5 and the outer vibration damping layer 4, and improves the efficiency of the vibration damping system. In addition, since the outer vibration damping layer 4 is arranged radially outside the yoke 1, the provision of the first inner vibration damping layer 501 is equivalent to serving as a connecting component, making the connection between the positioning groove 5 and the outer vibration damping layer 4 tighter, improving the integrity and integrity of the vibration damping structure, and enhancing the stiffness and stability of the vibration damping structure.

[0035] See also Figures 2 to 6 As shown in the figure, a second inner vibration damping layer 301 is provided in the reflection groove 3 , and a first end 511 of the first inner vibration damping layer 501 is connected to the second inner vibration damping layer 301 .

[0036] Specifically, the reflection groove 3 can play a reflective role, but the degree of reflection is limited. Therefore, it is preferred to set a filling material in the reflection groove 3, that is, the second inner vibration damping layer 301, to enhance the vibration damping ability while also limiting the outer vibration damping layer 4. The electromagnetic force wave propagates from the tooth portion 2 toward the yoke portion 1 and reaches the position of the reflection groove 3. The reflection groove 3 reflects part of the electromagnetic force wave back to the tooth portion 2. These reflected electromagnetic force waves and the electromagnetic force waves transmitted from the adjacent tooth portion 2 are offset, thereby weakening the energy of the electromagnetic force wave. The remaining electromagnetic force wave enters the second inner vibration damping layer 301 set in the reflection groove 3, which can absorb part of the electromagnetic force wave energy. In addition to absorbing energy, the second inner vibration damping layer 301 also plays a guiding role, transmitting the remaining electromagnetic force wave to the first inner vibration damping layer 501 connected to it. The first end 511 of the first inner vibration damping layer 501 is connected to the second inner vibration damping layer 301, and the second end 512 is connected to the outer vibration damping layer 4. The first inner vibration damping layer 501 absorbs and dissipates the electromagnetic force wave again, further weakening the energy of the electromagnetic force wave, thereby guiding the remaining electromagnetic force wave to the outer vibration damping layer 4.

[0037] In this embodiment, by absorbing the energy of electromagnetic force waves, the first inner vibration-damping layer 501 can effectively reduce the vibration amplitude of the motor stator, thereby reducing vibration and noise during motor operation. The first end 511 of the first inner vibration-damping layer 501 is connected to the second inner vibration-damping layer 301, and the second end 512 is connected to the outer vibration-damping layer 4. These layers guide the electromagnetic force waves from the reflective groove 3 to the outer vibration-damping layer 4, ensuring that the electromagnetic force waves can smoothly propagate to the outer vibration-damping layer 4 for further attenuation. After the second inner vibration-damping layer 301 initially absorbs and attenuates the electromagnetic force waves in the reflective groove 3, the first inner vibration-damping layer 501 further absorbs and dissipates the remaining electromagnetic force waves. The two layers work together to weaken the electromagnetic force wave energy and enhance the vibration damping effect. The first inner vibration-damping layer 501 transmits the weakened electromagnetic force waves to the outer vibration-damping layer 4, which further absorbs and dissipates the remaining electromagnetic force wave energy, forming a multi-stage vibration damping system. This synergistic effect enables the entire vibration damping system to more effectively reduce electromagnetic vibrations and improve the smoothness and reliability of motor operation. By synergizing with the second inner vibration-damping layer 301 and the outer vibration-damping layer 4, reliance on a single vibration-damping structure is reduced, improving the redundancy and reliability of the entire vibration-damping system. Even if the vibration-damping effect of one structure decreases due to certain factors, the other structures can continue to function, maintaining the overall vibration-damping effect. Furthermore, because the reflective groove 3 and the vibration-damping layer 4 are filled with the same material to form an integrated structure, the reflective groove 3 and the positioning groove 5, after being filled with material, can also position the outer vibration-damping layer, preventing it from tangential sliding. The provision of the first inner vibration-damping layer 501 creates a tighter connection between the reflective groove 3, the second inner vibration-damping layer 301, and the outer vibration-damping layer 4, improving the integrity and integrity of the vibration-damping structure and enhancing its rigidity and stability.

[0038] See also Figures 2 to 6 As shown in the figure, both ends of the positioning groove 5 and the reflecting groove 3 pass through both ends of the stator punching sheet, and the outer vibration damping layer 4, the first inner vibration damping layer 501 and the second inner vibration damping layer 301 are integrally formed.

[0039] In this embodiment, the one-piece molding setting integrates the three vibration-damping layers into a continuous whole, eliminating the connection gaps and interfaces between the layers, so that the electromagnetic force wave can smoothly pass through each vibration-damping part during the transmission process without crossing different materials or structural interfaces, thereby improving the integrity and synergy of the vibration-damping system. Since there is no obvious boundary between the three vibration-damping layers, the transmission of electromagnetic force waves between the vibration-damping layers is more efficient, and the energy absorption and dissipation process is more continuous, which can more effectively weaken the energy of the electromagnetic force wave and enhance the performance of the entire vibration-damping system. In addition, the one-piece molding structure avoids the problems of loosening and falling off that may occur due to the bonding or connection between multiple vibration-damping layers, improves the stability of the vibration-damping structure in a long-term vibration environment, ensures the durability of the vibration-damping effect, and the continuous overall structure has better mechanical strength and rigidity, can better resist various mechanical stresses during the operation of the motor, reduce structural deformation or damage caused by vibration, and extend the service life of the vibration-damping structure.

[0040] As a specific embodiment, the shape and size of the first inner vibration-damping layer 501 and the second inner vibration-damping layer 301 are determined by the reflective groove 3 and the positioning groove 5, respectively. Adjusting the configuration of the inner vibration-damping layers can be achieved by adjusting the configuration of the reflective groove 3 and the positioning groove 5. Furthermore, the integrally molded vibration-damping structure can be customized according to the specific shape and size of the stator lamination assembly, better fitting the stator's geometry and improving the space utilization and adaptability of the vibration-damping structure.

[0041] See also Figures 2 to 6 As shown in the figure, the outer vibration damping layer 4 , the first inner vibration damping layer 501 and the second inner vibration damping layer 301 are integrally formed by filling with reflective material, and the material strength of the reflective material is greater than the material strength of the yoke 1 .

[0042] In this embodiment, since the strength of the reflective material is greater than that of the yoke 1 material, the integrally molded vibration damping structure has higher mechanical strength. During the operation of the motor, the stator punching assembly will be subjected to various mechanical stresses, such as electromagnetic force, centrifugal force, etc. The high-strength vibration damping structure can better resist these stresses, reduce structural deformation or damage caused by vibration, and reduce the risk of the vibration damping layer falling off or failing, thereby improving the stability and reliability of the motor operation. Under different motor operating conditions, the intensity and frequency of the electromagnetic force wave may vary. The integrally molded reflective material can adapt to these changes. By effectively reflecting and absorbing the electromagnetic force wave, the vibration damping structure can maintain a good vibration damping effect under various operating conditions, thereby improving the adaptability and versatility of the motor.

[0043] As a specific embodiment, the specific function of the vibration damping layer will vary depending on the selected material. The reflective material must ensure that the material strength is higher than the iron core to withstand the mechanical stress during motor operation, and should have good reflective properties to reduce noise transmission. Common reflective materials that meet the above requirements include stainless steel, ceramic materials, aluminum alloys, carbon fiber composites, etc. The cost of different materials varies greatly, and the selection must be based on the budget. Soft vibration damping materials must have good vibration damping performance while not adversely affecting the magnetic properties of the motor. Common soft vibration damping materials include polyurethane rubber, silicone rubber, and damping materials such as polyacrylate. The actual selection can be based on a comprehensive consideration of factors such as the motor's operating environment, temperature, vibration frequency, and cost. In this embodiment, the outer vibration damping layer 4, the first inner vibration damping layer 501, and the second inner vibration damping layer 301 are preferably formed by filling the same material. In other embodiments, the first inner vibration damping layer 501 and the second inner vibration damping layer 301 can also use the same material, while the outer vibration damping layer 4 uses a different reflective material.

[0044] As a specific embodiment, the outer vibration damping layer 4, the first inner vibration damping layer 501, and the second inner vibration damping layer 301 are formed using a glue potting tool. The front and rear sides of the glue potting tool are tightly attached to the stator core, completely covering the reflection groove 3 and the positioning groove 5. A certain distance (the thickness of the vibration damping layer) is left between the inner wall of the tooling and the outer circumference of the stator core. Glue is then fully poured through the glue potting port, which is located at both ends of the stator core (not on the outer circumference). During the glue potting process, the outer vibration damping layer 4 is fixed by the positioning groove 5 of the stator yoke 1. During the stator injection molding, the outer vibration damping layer 4 is also wrapped with the outer wall of the stator core to completely fix it and prevent it from sliding and falling off.

[0045] See also Figures 2 to 6 As shown in the figure, the reflective groove 3 is V-shaped, the opening of the reflective groove 3 faces the radial outside of the yoke 1, and a reflective groove 302 is provided at the vertex of the reflective groove 3.

[0046] Specifically, when the reflection groove 3 is arranged in a V shape on the yoke 1, when the electromagnetic force wave propagates to the apex of the reflection groove 3, the reflection groove 302 will reflect the electromagnetic force wave back more concentratedly, increasing the intensity and directionality of the reflection, so that more electromagnetic force wave energy is reflected back to the tooth 2 and offsets the electromagnetic force wave of the adjacent tooth 2. When the electromagnetic force wave propagates from the tooth 2 to the yoke 1 and enters the V-shaped reflection groove 3, the two inclined surfaces of the reflection groove 3 will reflect the electromagnetic force wave back to the tooth 2 area. The V-shaped structure can effectively change the propagation direction of the electromagnetic force wave, causing the electromagnetic force wave to be reflected multiple times in the reflection groove 3. The reflection groove 3 and the reflection groove 302 reflect part of the electromagnetic force wave back to the tooth 2. These reflected electromagnetic force waves meet the electromagnetic force waves normally propagating from the adjacent tooth 2 and offset each other. Although most electromagnetic force waves are reflected and offset, some still propagate along the reflective slot 3 toward the opening (i.e., radially outward of the yoke 1). The V-shaped structure of the reflective slot 3 guides these remaining electromagnetic force waves in a specific direction and along a specific path, allowing them to enter the subsequent positioning slot 5 and outer vibration damping layer 4. The electromagnetic force waves that enter the positioning slot 5 encounter the first inner vibration damping layer 501 and are then guided to the outer vibration damping layer 4, where the remaining energy is ultimately absorbed and dissipated.

[0047] In this embodiment, the two inclined surfaces of the V-shaped reflection groove 3 can cause the electromagnetic force wave to be reflected multiple times in the groove, increasing the propagation path and the number of reflections of the electromagnetic force wave in the reflection groove 3, thereby more effectively weakening the energy of the electromagnetic force wave. The reflection groove 302 is located at the apex of the V-shaped reflection groove 3, which can reflect the electromagnetic force wave back more concentratedly, enhance the intensity and directionality of the reflection, so that more electromagnetic force wave energy is reflected back to the tooth 2 and offsets the electromagnetic force wave of the adjacent tooth 2. The setting of the reflection arc is intended to increase the contact area and further enhance the vibration reduction effect. The setting of the reflection groove 302 makes the reflected electromagnetic force wave energy more concentrated, further enhances the effect of offsetting the electromagnetic force wave of the adjacent tooth 2, improves the vibration reduction efficiency, and the setting of the reflection groove 302 can disperse the stress at the apex, reduce local stress concentration, reduce the risk of material fatigue and structural damage caused by stress concentration, and extend the service life of the vibration reduction structure. In other embodiments, the distance between the reflection groove 3 and the outer surface of the punch body can be increased to ensure the structural strength of the iron core parts on the left and right sides of the positioning groove 5 and avoid deformation during the glue pouring process. A reflection arc is provided at the top of the positioning groove 5 to weaken the radial electromagnetic force wave.

[0048] As a specific implementation method, this embodiment preferably has the reflective groove 3 in a V-shape to avoid deformation during the sample making or glue pouring process. Reflective grooves of other shapes must ensure a distance from the outer surface of the iron core to prevent deformation. In other embodiments, the structure of the reflective groove 3 can also be an arc shape, or other shapes that increase the contact area on the basis of the V-shape and can complete processing.

[0049] As a specific embodiment, when the reflection groove 3 is a double-layer structure, on the basis of providing one layer of reflection groove 3, another layer of reflection groove 3 is provided on the radial inner side of the reflection groove 3, that is, on the side close to the center of the circle. The two reflection grooves 3 can both be V-shaped, or one V-shaped and the other arc-shaped.

[0050] See also Figures 2 to 6 As shown in the figure, the reflective groove 302 is arc-shaped, the diameter of the reflective groove 302 is d, and the value range of the diameter d is 0.5mm~1.5mm. The angle of the reflective groove 3 is α, and the value range of the angle α is 30°~90°.

[0051] In this embodiment, the diameter d is preferably 1 mm, and the vertical distance between the center of the circle and the surface of the punch body is 2.5 mm. The reflection effect of the reflection arc on the radial electromagnetic force wave can be improved by increasing the diameter or reducing the distance between the center of the circle and the surface of the iron core. In other embodiments, the reflection groove 302 can also have other shapes. The angle α is 45°, and the propagation path of the electromagnetic force wave can be changed by adjusting the angle α.

[0052] As a preferred embodiment, this embodiment comprises a first inner vibration-damping layer 501 disposed in the positioning groove 5, and a second inner vibration-damping layer 301 disposed in the reflective groove 3. The first end 511 of the first inner vibration-damping layer 501 is connected to the second inner vibration-damping layer 301, and the second end 512 of the first inner vibration-damping layer 501 is connected to the outer vibration-damping layer 4. The reflective groove 3 is V-shaped, with its opening facing radially outward of the yoke 1. A reflective groove 302 is disposed at the apex of the reflective groove 3. With this arrangement, the second inner vibration-damping layer 301 disposed in the reflective groove 3 can simultaneously attenuate force waves and hook the vibration-damping layer, preventing radial displacement of the outer vibration-damping layer 4. The positioning groove 5 prevents the vibration-damping layer from tangentially displacing. To minimize the impact of the reflective groove 3 and the positioning groove 5 on motor performance, the junction center of the positioning groove 5 is aligned with the geometric center of the tooth portion 2.

[0053] As a specific implementation method, the outer vibration damping layer 4 is fixed in two steps. First, the reflection groove 3 and the positioning groove 5 are used to prevent the vibration damping layer from radial and tangential displacement. Then, when the iron core is placed in the shell, the front and rear shells can prevent the vibration damping layer from axially falling off. When the plastic-coated stator is overmolded, the vibration damping layer and the iron core can be directly wrapped together to fix them.

[0054] See also Figures 2 to 6 The figure shows a stator core, including a stator punching assembly, which is the stator punching assembly described above. In this embodiment, the stator punching assembly is formed by stacking multiple stator punching bodies in sequence, and the stator core is formed by stacking multiple sections of stator punching assemblies.

[0055] A motor includes a stator core, which is the stator core described above. When the stator core described above is used, a reflection groove 3 and an outer vibration damping layer 4 are provided at the same time. The reflection groove 3 reflects part of the electromagnetic force wave back to the tooth portion 2 and offsets the electromagnetic force wave on the adjacent tooth portion 2, thereby preliminarily weakening the energy of the electromagnetic force wave. Remaining electromagnetic force waves are still transmitted from the yoke 1. At this time, the outer vibration damping layer 4 is arranged radially outside the yoke 1. When the electromagnetic force wave propagates to the outer vibration damping layer 4, the outer vibration damping layer 4 further weakens the remaining part of the electromagnetic force wave, further reducing the intensity of the electromagnetic force wave. Through this multi-stage attenuation method, the vibration caused by the electromagnetic force wave can be more effectively reduced and the smoothness of the motor operation can be improved. Although the reflection groove 3 can weaken and offset the electromagnetic force wave to a certain extent, it may not be able to completely eliminate all electromagnetic force waves. The outer vibration damping layer 4 can further process the remaining electromagnetic force waves that the reflection groove 3 fails to weaken, making up for the insufficient vibration damping effect of the reflection groove 3, thereby achieving a more comprehensive vibration damping effect. The reflective groove 3 and the outer vibration-damping layer 4 together form a multi-stage vibration-damping system. Under different operating conditions, the intensity and frequency of the electromagnetic force wave may vary. This multi-stage vibration-damping approach improves the stability and reliability of the vibration-damping effect, ensuring that the motor maintains good vibration-damping performance under various operating conditions.

[0056] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A stator punching assembly, characterized in that: include: Punch body and vibration reduction structure; The punching plate body comprises a yoke portion (1) and a tooth portion (2), and a plurality of the tooth portions (2) are arranged at intervals on the radial inner side of the yoke portion (1); The vibration damping structure comprises a reflection groove (3) and an outer vibration damping layer (4); the reflection groove (3) is arranged on the yoke (1), and the reflection groove (3) is located on the transmission path of the electromagnetic force wave in the tooth portion (2); the outer vibration damping layer (4) is arranged on the radial outer side of the yoke (1); the reflection groove (3) is used to weaken a part of the electromagnetic force wave, and the outer vibration damping layer (4) is used to weaken the remaining part of the electromagnetic force wave.

2. The stator punching assembly according to claim 1, characterized in that: The vibration damping structure further comprises a positioning groove (5), wherein in the radial direction of the yoke (1), one end of the positioning groove (5) is connected to the reflection groove (3), and the other end of the positioning groove (5) extends toward the outer peripheral wall of the yoke (1).

3. The stator punching assembly according to claim 2, characterized in that: A first inner vibration damping layer (501) is provided in the positioning groove (5), a first end (511) of the first inner vibration damping layer (501) extends toward the reflecting groove (3), and a second end (512) of the first inner vibration damping layer (501) is connected to the outer vibration damping layer (4).

4. The stator punching assembly according to claim 3, characterized in that: A second inner vibration damping layer (301) is provided in the reflection groove (3), and a first end (511) of the first inner vibration damping layer (501) is connected to the second inner vibration damping layer (301).

5. The stator punching assembly according to claim 4, characterized in that: The outer vibration damping layer (4), the first inner vibration damping layer (501) and the second inner vibration damping layer (301) are integrally formed.

6. The stator punching assembly according to claim 5, characterized in that: The outer vibration damping layer (4), the first inner vibration damping layer (501) and the second inner vibration damping layer (301) are integrally formed by filling a reflective material, and the material strength of the reflective material is greater than the material strength of the yoke (1).

7. The stator punching assembly according to claim 1, characterized in that: The reflective groove (3) is V-shaped, the opening of the reflective groove (3) faces the radial outside of the yoke (1), and a reflective groove (302) is provided at the vertex of the reflective groove (3).

8. The stator punching assembly according to claim 7, characterized in that: The reflective groove (302) is arc-shaped, the diameter of the reflective groove (302) is d, the value range of the diameter d is 0.5mm~1.5mm, the angle of the reflective groove (3) is α, and the value range of the angle α is 30°~90°.

9. A stator core, comprising a stator punching assembly, characterized in that: The stator punching sheet assembly is the stator punching sheet assembly according to any one of claims 1 to 8.

10. A motor comprising a stator core, characterized in that: The stator core is the stator core according to claim 9.

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