Stator lamination, stator and electric machine

Abstract

The application discloses a stator lamination, a stator and a motor, and relates to the technical field of motors, wherein the stator lamination comprises a lamination body, a connecting part and a mounting part; one end of the connecting part is connected to the circumferential side of the lamination body, and the mounting part is connected to the end of the connecting part away from the lamination body; wherein the width of the connecting part is smaller than the width of the mounting part. The technical scheme provided by the application can reduce the noise of the motor, thereby improving the use experience of users.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator lamination, a stator, and a motor. Background Technology

[0002] In hybrid or range-extended electric vehicles, the generator is connected to the engine, and the engine drives the generator to generate electricity to power the vehicle. The generator stator is typically mounted and fixed to the housing with bolts.

[0003] In related technologies, an "ear" structure is installed on the stator. This structure includes a connecting part and a mounting part. The connecting part is attached to the stator, and the mounting part is used to engage with bolts to fix the stator to the housing. Since the stator and housing are connected by bolts, a structural mode with relative torsion between them is formed. The frequency of this mode is closely related to the structural stiffness of the connecting part. However, the structural stiffness of the connecting part in related technologies is relatively high, resulting in a high torsional mode frequency of the stator. When the generator operates at a certain speed, the motor torque pulsation frequency matches this torsional mode frequency, causing resonance and resulting in significant noise, affecting the user experience. Summary of the Invention

[0004] The main objective of this invention is to provide a stator lamination, a stator, and a motor, which aims to reduce motor noise and improve the user experience.

[0005] To achieve the above objectives, the present invention provides a stator lamination comprising:

[0006] Film processing body;

[0007] A connecting part, one end of which is connected to the periphery of the stator;

[0008] The mounting portion is connected to the end of the connecting portion away from the lamination body; wherein the width of the connecting portion is smaller than the width of the mounting portion.

[0009] In one embodiment of the present invention, the minimum width of the connecting portion is less than the maximum width of the mounting portion.

[0010] In one embodiment of the present invention, the maximum width of the connecting portion is less than the minimum width of the mounting portion.

[0011] In one embodiment of the present invention, the mounting portion is connected to the lamination body only through one of the connecting portions.

[0012] In one embodiment of the present invention, the mounting part is provided with a mounting hole for engaging with a fastener.

[0013] In one embodiment of the present invention, the width of the connecting part is defined as W, and the diameter of the mounting hole is defined as D, then W≤2D.

[0014] In one embodiment of the present invention, the width of the connecting part is defined as W, and the diameter of the mounting hole is defined as D, then W≥0.5D.

[0015] In one embodiment of the present invention, the width of the connecting portions is uniform.

[0016] In one embodiment of the present invention, the connecting portion is made of the same material as the lamination body or the mounting portion.

[0017] In one embodiment of the present invention, the connecting portion is connected to the mounting portion, and there are at least two sets of them, which are distributed at intervals along the circumference of the lamination body.

[0018] To achieve the above objectives, the present invention also proposes a stator, comprising: stator laminations as described above, wherein a plurality of the stator laminations are stacked to form a single unit.

[0019] To achieve the above objectives, the present invention also provides an electric motor, comprising:

[0020] chassis;

[0021] The stator described above is disposed inside the housing, and the mounting portion is connected to the housing by fasteners;

[0022] The rotor is arranged coaxially with the stator.

[0023] The technical solution of this invention uses a connecting part and a mounting part to fix the lamination body onto the housing. By modifying the structural features of the connecting part and the mounting part, the width of the connecting part is designed to be smaller than the width of the mounting part, thereby reducing the width of the connecting part. Since a smaller connecting part results in lower structural stiffness, the torsional mode frequency of the stator is lower. This allows the torsional mode frequency of the stator to avoid the motor torque pulsation frequency, preventing resonance between the stator's torsional mode frequency and the motor torque pulsation frequency. This effectively reduces motor noise and improves the user experience. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of the structure of an embodiment of the stator lamination provided by the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of part of the structure.

[0027] Explanation of icon numbers:

[0028] label name label name 100 Stator lamination 21 Connection part 10 Film processing body 22 Installation Department 20 Installation structure 221 Mounting holes

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] In hybrid or range-extended electric vehicles, the generator is connected to the engine, and the engine drives the generator to generate electricity to power the vehicle. The generator stator is typically mounted and fixed to the housing with bolts.

[0034] In related technologies, an "ear" structure is installed on the stator. This structure includes a connecting part and a mounting part. The connecting part is attached to the stator, and the mounting part is used to engage with bolts to fix the stator to the housing. Since the stator and housing are connected by bolts, a structural mode with relative torsion between them is formed. The frequency of this mode is closely related to the structural stiffness of the connecting part. However, the structural stiffness of the connecting part in related technologies is relatively high, resulting in a high torsional mode frequency of the stator. When the generator operates at a certain speed, the motor torque pulsation frequency matches this torsional mode frequency, causing resonance and resulting in significant noise, affecting the user experience.

[0035] Based on the above problems, the present invention proposes a stator lamination 100, which aims to reduce motor noise and improve the user experience.

[0036] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the stator lamination 100 includes a lamination body 10, a connecting portion 21, and a mounting portion 22; one end of the connecting portion 21 is connected to the periphery of the lamination body 10, and the mounting portion 22 is connected to the end of the connecting portion 21 away from the lamination body 10; wherein, the width of the connecting portion 21 is smaller than the width of the mounting portion 22.

[0037] The technical solution of this invention uses a connecting part 21 and a mounting part 22 to mount and fix the lamination body 10 onto the housing. By modifying the structural features of the connecting part 21 and the mounting part 22, the width of the connecting part 21 is designed to be smaller than the width of the mounting part 22, thereby reducing the width of the connecting part 21. Since a smaller width of the connecting part 21 results in lower structural rigidity, the torsional modal frequency of the stator is lower. This allows the torsional modal frequency of the stator to avoid resonance with the motor torque pulsation frequency, effectively reducing motor noise and improving the user experience.

[0038] In this embodiment, the lamination body 10 can be designed by stacking a plurality of stator iron sheets, with the stator winding wound around the lamination body. The connecting part 21 and the mounting part 22 can form a mounting structure 20.

[0039] In practical applications, the connecting part 21 and the mounting part 22 can be integrally stamped, or they can be connected by means of bonding, screw connection, snap-fit, plug-in, etc. Of course, in some embodiments, in order to simplify the manufacturing process and improve the connection reliability between the connecting part 21 and the mounting part 22, the connecting part 21 and the mounting part 22 can be integrally stamped.

[0040] Furthermore, the connecting part 21 and the stamping body 10 can be integrally stamped, or they can be connected by means of bonding, screw connection, snap-fit, or plug-in. Of course, in some embodiments, in order to simplify the manufacturing process and improve the connection reliability between the connecting part 21 and the stamping body 10, the connecting part 21 and the stamping body 10 can also be integrally stamped.

[0041] In practical applications, the cross-sectional shape of the connecting part 21 can be rectangular, trapezoidal, circular, elliptical, or irregular, meaning the width of the connecting part 21 can be consistent or inconsistent at different locations. Similarly, the cross-sectional shape of the mounting part 22 of the mounting structure 20 can also be rectangular, trapezoidal, circular, elliptical, or irregular, meaning the width of the mounting part 22 can be consistent or inconsistent at different locations, as long as the width of the connecting part 21 is less than the width of the mounting part 22.

[0042] It should be noted that the width of the connecting portion 21 is smaller than the width of the mounting portion 22. This can be understood as follows: the width of the connecting portion 21 at one point may be smaller than the width of the mounting portion 22 at another point, while the width of the connecting portion 21 at other points may be greater than or equal to the width of the mounting portion 22 at other points; alternatively, the width of the connecting portion 21 at one point may be smaller than the width of all points of the mounting portion 22, while the width of the connecting portion 21 at other points may be equal to the width of the mounting portion 22 at other points; or, the width of the connecting portion 21 at all points may be smaller than the width of all points of the mounting portion 22, meaning the maximum width of the connecting portion 21 is smaller than the minimum width of the mounting portion 22.

[0043] Furthermore, this solution, by designing the width of the connecting part 21 to be smaller than the width of the mounting part 22, does not increase manufacturing costs and weight, is simple to implement, and can achieve good noise reduction effect.

[0044] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the minimum width of the connecting portion 21 is less than the maximum width W1 of the mounting portion 22.

[0045] By designing the minimum width of the connecting part 21 to be less than the maximum width W1 of the mounting part 22, the width of the connecting part 21 at least once is less than the width of the mounting part 22 at least once. Since the rigidity of the connecting part 21 mainly depends on the minimum width of the connecting part 21, the structural rigidity of the connecting part 21 can be effectively reduced by making the minimum width of the connecting part 21 less than the maximum width of the mounting part 22. This results in a lower torsional mode frequency of the stator, which can effectively avoid the motor torque pulsation frequency.

[0046] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the maximum width of the connecting portion 21 is less than the minimum width of the mounting portion 22.

[0047] By designing the maximum width of the connecting part 21 to be less than the minimum width of the mounting part 22, the width of all positions of the connecting part 21 is smaller than the width of all positions of the mounting part 22. This results in lower structural rigidity of the connecting part 21 and a lower torsional mode frequency of the stator. Consequently, the torsional mode frequency of the stator can effectively avoid the motor torque pulsation frequency, thus better preventing resonance between the torsional mode frequency of the stator and the motor torque pulsation frequency. This effectively reduces motor noise and improves the user experience.

[0048] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the mounting part 22 is connected to the lamination body 10 only through a connecting part 21.

[0049] It should be noted that if the mounting part is connected to the stamping body by two or more parallel connecting parts, during the stamping process, taking two connecting parts as an example, the two parallel connecting parts need to punch holes in the middle, which requires high positional accuracy of the punching holes and high requirements for stamping equipment or processes. However, this solution uses only one connecting part 21 to connect the mounting part 22 to the stamping body 10, which can make the overall strength of the connecting part 21 high. At the same time, during the stamping process, it avoids punching any position in the middle of the connecting part 21, which can reduce the requirements for stamping accuracy.

[0050] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the mounting part 22 is provided with a mounting hole 221, which is used to cooperate with a fastener.

[0051] In this embodiment, the mounting hole 221 can be a bolt hole, and the fastener can be a bolt, so that the bolt engages with the bolt hole thread when it passes through the bolt hole.

[0052] With this configuration, during assembly, bolts can be directly passed through the mounting holes 221 of the mounting part 22 and inserted into the bolt holes on the housing, thus fixing the stamping body 10 to the housing with bolts, which facilitates the installation between the stamping body 10 and the housing.

[0053] In some embodiments, to facilitate the molding of the mounting portion 22, it can be designed with a circular cross-sectional shape. This design makes the outer periphery of the mounting portion 22 smoother, preventing scratches on other components during assembly. Furthermore, to ensure the structural strength of the mounting portion 22, the mounting hole 221 can be designed in the center of the mounting portion 22, so that the center of the mounting hole 221 coincides with the center of the mounting portion 22. This ensures that the structural strength of the mounting portion 22 is relatively uniform at various locations, effectively guaranteeing its structural strength and reducing the risk of breakage during use.

[0054] Please see Figure 2 In one embodiment of the present invention, the width of the connecting part 21 is defined as W, and the diameter of the mounting hole 221 is defined as D, then W≤2D is satisfied.

[0055] With this configuration, the ratio between the width W of the connecting part 21 and the diameter D of the mounting hole 221 affects the structural stiffness of the connecting part 21. By setting W ≤ 2D, the structural stiffness of the connecting part 21 can be effectively reduced, thereby effectively reducing motor noise. If the width W of the connecting part 21 is too large, the reduction in structural stiffness will not be significant enough, and the noise reduction effect on the motor will be insignificant. Therefore, this range of settings can effectively reduce the structural stiffness of the connecting part 21, and significantly improve the noise reduction effect on the motor.

[0056] Please see Figure 2 In one embodiment of the present invention, the width of the connecting part 21 is defined as W, and the diameter of the mounting hole 221 is defined as D, then W≥0.5D is satisfied.

[0057] With this configuration, the ratio between the width W of the connecting part 21 and the diameter D of the mounting hole 221 can also affect the structural strength of the connecting part 21. By setting W ≥ 0.5D, sufficient connection strength can be ensured for the connecting part 21, preventing deformation or even breakage during motor operation. If the width W of the connecting part 21 is too small, although the structural stiffness of the connecting part 21 is reduced, its structural strength will also decrease. Therefore, this range of settings can effectively ensure sufficient structural strength for the connecting part 21 while reducing its structural stiffness, effectively preventing damage to the connecting part 21 during operation.

[0058] As some examples, the relationship between the width W of the connecting part 21 and the diameter D of the mounting hole 221 can be as follows: W = 2D, W = 1.9D, W = 1.8D, W = 1.7D, W = 1.6D, W = 1.5D, W = 1.4D, W = 1.3D, W = 1.2D, W = 1.1D, W = D, W = 0.9D, W = 0.8D, W = 0.7D, W = 0.6D, W = 0.5D, etc.

[0059] It should be noted that since the generator speed in hybrid or range-extended electric vehicles mainly depends on the engine speed, and the engine generally operates above idle speed, speeds below idle speed are not used. This means that the motor has a minimum frequency f, ensuring that the torque pulsation frequency of the main order of the generator operation is greater than or equal to f. Therefore, by using the stator lamination 100 provided by this invention, with the minimum width of the connecting portion 21 being smaller than the maximum width of the mounting portion 22, and the ratio between the width W of the connecting portion 21 and the diameter D of the mounting hole 221 being 0.5D≤W≤2D, the torsional mode frequency of the stator can be reduced to be less than the minimum value f of the motor's torque pulsation frequency. This prevents resonance between the main order torque pulsation frequency of the engine and the torsional mode of the stator, thereby effectively reducing the operating noise of the generator.

[0060] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the width of the connecting portion 21 is uniform. That is, the cross-sectional shape of the connecting portion 21 is rectangular.

[0061] This design, by making the width of the connecting parts 21 uniform, not only makes it easier to form the connecting parts 21, but also effectively ensures that the connecting parts 21 have sufficient structural strength while reducing the structural rigidity of the connecting parts 21.

[0062] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the connecting part 21 and the mounting part 22 are connected by an arc. This arrangement allows the connecting part 21 and the mounting part 22 to be connected by an arc segment, reducing the possibility of stress at the connection between the connecting part 21 and the mounting part 22, improving the reliability of the connection between the connecting part 21 and the mounting part 22, and preventing damage to the connection between the connecting part 21 and the mounting part 22 during motor operation.

[0063] Please see Figure 1 , Figure 2In one embodiment of the present invention, the connecting part 21 is connected to the lamination body 10 by an arc. With this configuration, the connecting part 21 and the lamination body 10 can be connected together by an arc segment, which reduces the possibility of stress at the connection between the connecting part 21 and the lamination body 10, improves the connection reliability between the connecting part 21 and the lamination body 10, and avoids damage to the connection between the connecting part 21 and the lamination body 10 during motor operation.

[0064] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the connecting part 21 and the stamping body 10 or the mounting part 22 are made of the same material.

[0065] With this configuration, by designing the connecting part 21 and the lamination body 10 or the mounting part 22 to be made of the same material, the stator lamination 100 can be integrally stamped, which can effectively save processes.

[0066] Please see Figure 1 In one embodiment of the present invention, the connecting part 21 is connected to the mounting part 22, and there are at least two sets of them, which are distributed at intervals along the circumference of the lamination body 10.

[0067] With this configuration, by using at least two sets of connecting parts 21 and mounting parts 22 to install and fix the lamination body 10 on the housing, the installation reliability of the lamination body 10 on the housing can be improved, and the lamination body 10 can be prevented from moving or even falling off relative to the housing during motor operation, thus affecting the service life of the motor.

[0068] The present invention also proposes a stator, the motor including stator laminations 100. The specific structure of the stator laminations 100 is as described in the above embodiments. Since this stator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Multiple stator laminations 100 are stacked to form a single unit to constitute the stator.

[0069] The present invention also proposes an electric motor, which includes a housing, a stator, and a rotor. The specific structure of the stator is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The stator is disposed inside the housing, and the mounting part 22 is connected to the housing by fasteners; the rotor is arranged coaxially with the stator.

[0070] Understandably, in the motor proposed in this solution, the stator is mounted and fixed to the motor housing by using fasteners and mounting part 22. The structural features of the connecting part 21 and mounting part 22 are modified so that the width of the connecting part 21 is smaller than the width of the mounting part 22, thereby reducing the width of the connecting part 21. Since a smaller width of the connecting part 21 results in lower structural rigidity, the torsional modal frequency of the stator is lower. This allows the torsional modal frequency of the stator to avoid the motor torque pulsation frequency, preventing resonance between the torsional modal frequency and the motor torque pulsation frequency. This effectively reduces motor noise and improves the user experience.

[0071] This motor can be used in vehicles, including hybrid or range-extended electric vehicles, as well as natural gas vehicles.

[0072] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator lamination, characterized in that, include: Film processing body; A connecting part, one end of which is connected to the periphery of the lamination body; The mounting portion is connected to the end of the connecting portion away from the lamination body; wherein the width of the connecting portion is smaller than the width of the mounting portion.

2. The stator lamination as described in claim 1, characterized in that, The minimum width of the connecting part is less than the maximum width of the mounting part.

3. The stator lamination as described in claim 1, characterized in that, The maximum width of the connecting part is less than the minimum width of the mounting part.

4. The stator lamination as described in claim 1, characterized in that, The mounting part is connected to the lamination body only through one of the connecting parts.

5. The stator lamination as described in claim 1, characterized in that, The mounting part is provided with mounting holes for engaging with fasteners.

6. The stator lamination as described in claim 5, characterized in that, Let the width of the connecting part be W, and the diameter of the mounting hole be D, then W ≤ 2D.

7. The stator lamination as described in claim 5, characterized in that, Let the width of the connecting part be W, and the diameter of the mounting hole be D, then W≥0.5D.

8. The stator lamination as described in claim 1, characterized in that, The width of the connecting parts is consistent.

9. The stator lamination as described in any one of claims 1 to 8, characterized in that, The connecting part is made of the same material as the stamping body or the mounting part.

10. The stator lamination as described in claim 1, characterized in that, The connecting part is connected to the mounting part, and there are at least two sets of them, which are distributed at intervals along the circumference of the lamination body.

11. A stator, characterized in that, include: The stator laminations as described in any one of claims 1 to 10, wherein a plurality of the stator laminations are stacked to form a single unit.

12. An electric motor, characterized in that, include: chassis; The stator as described in claim 11, wherein the stator is disposed within the housing, and the mounting portion is connected to the housing by fasteners; The rotor is arranged coaxially with the stator.

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