Motor, power assembly and vehicle
By setting a recess on the outer periphery of the stator core and filling it with colloid to form a mechanical lock, the problem of insufficient connection strength between the stator core and the housing is solved, achieving higher torque transmission capacity and motor stability and quietness.
Patent Information
- Application Number
- CN202520198226.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-08
AI Technical Summary
In existing technologies, the connection strength between the stator core and the housing is insufficient to meet the requirements of larger torques, especially in small and medium-sized motors where the connection strength is limited.
A recess is provided on the outer periphery of the stator core, and a glue is filled between the stator core and the housing to fill the recess, forming a mechanical lock and enhancing the connection strength.
It improves the connection strength between the stator core and the housing, enabling more effective torque transmission, suppressing stator core vibration, enhancing noise reduction and overall NVH performance, and strengthening the structural integrity and pressure resistance.
Smart Images
Figure CN223899013U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electric motor technology, and more particularly to an electric motor, powertrain, and vehicle. Background Technology
[0002] In motor design, using potting adhesive to fix the stator core to the housing provides an effective stator fixing solution for small and medium-sized motors that are not suitable for interference fits.
[0003] However, this method has limited connection strength between the stator core and the housing, and is only suitable for motors with low torque requirements, and cannot meet the needs of larger torques. Utility Model Content
[0004] This application provides an electric motor, powertrain, and vehicle that improves the connection strength between the stator core and the housing to meet greater torque requirements, thereby at least partially solving the aforementioned technical problems.
[0005] To achieve the above objectives, according to a first aspect of this application, an electric motor is provided, comprising:
[0006] chassis;
[0007] A stator core is disposed within the housing, and a recess is provided on the outer peripheral side of the stator core; and...
[0008] The colloid is disposed between the outer periphery of the stator core and the housing, and is partially located in the recess.
[0009] Optionally, the stator core includes:
[0010] The stator yoke is arranged in a ring structure; and,
[0011] Multiple stator teeth, wherein the multiple stator teeth are arranged circumferentially on the inner circumferential side of the stator yoke;
[0012] The recessed portion is provided on the stator yoke, and in the circumferential direction of the stator core, the recessed portion is staggered from each stator tooth.
[0013] Optionally, a stator slot for accommodating the stator winding is formed between two adjacent stator teeth, and the recessed portion communicates with the stator slot so that the colloid portion is still located in the stator slot.
[0014] Optionally, the motor further includes an isolation sleeve, which is arranged in a ring structure;
[0015] The stator teeth abut against the outer periphery of the isolation sleeve along the circumferential direction, and the colloid is disposed between the outer periphery of the isolation sleeve and the housing.
[0016] Optionally, the stator core includes a plurality of stacked stator laminations, the plurality of stator laminations including two first stator laminations located at the axial ends of the stator core, and a second stator lamination sandwiched between the two first stator laminations, the recess being provided in the second stator lamination.
[0017] Optionally, the second stator laminations are provided in multiple portions, and some of the second stator laminations are provided with the recessed portions.
[0018] Optionally, one of any two adjacent second stator laminations may have the recessed portion.
[0019] Optionally, the housing has a groove on the side facing the stator core.
[0020] Optionally, the groove and the recess are staggered in the circumferential direction of the stator core.
[0021] Optionally, the groove extends along the axial direction of the stator core, and the cross-section of the groove along the radial direction of the stator core is arc-shaped.
[0022] Optionally, the groove extends along the axial direction of the stator core, from one end of the stator core in the axial direction to the other end, and the cross-sectional area of the groove is gradually reduced.
[0023] According to a second aspect of this application, a powertrain is provided, including an electric motor as described in any of the above claims.
[0024] According to a third aspect of this application, a vehicle is provided, including an electric motor as described in any of the above claims or a powertrain as described above.
[0025] In the motor of this application embodiment, by providing a recessed portion on the outer periphery of the stator core and filling the space between the stator core and the housing with colloid, the colloid fills the recessed portion, thus forming a mechanical lock between the colloid and the stator core, which can more effectively transmit torque, improve the connection strength between the stator core and the housing, and meet the larger torque requirements.
[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.
[0029] Figure 1 This is a three-dimensional schematic diagram of the motor provided in an exemplary embodiment of this disclosure;
[0030] Figure 2 yes Figure 1 A top view of the motor in the diagram;
[0031] Figure 3 yes Figure 1 A three-dimensional schematic diagram of the stator core and isolation sleeve in the figure;
[0032] Figure 4 yes Figure 3 A front view of the stator core and isolation sleeve in the diagram;
[0033] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the stator core in the image;
[0034] Figure 6 yes Figure 5 A top view of the stator core;
[0035] Figure 7 yes Figure 1 A three-dimensional schematic diagram of the casing;
[0036] Figure 8 yes Figure 7 A top view of the casing.
[0037] Explanation of reference numerals in the attached figures:
[0038] 100. Motor; 1. Housing; 11. Groove; 2. Stator core; 21. Recess; 22. Stator yoke; 23. Stator teeth; 24. Stator slot; 25. Stator laminations; 251. First stator laminations; 252. Second stator laminations; 3. Isolation sleeve; 4. Filling area. Detailed Implementation
[0039] The technical solutions of the embodiments of this application 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.
[0040] This application provides an electric motor, Figures 1 to 8 This is a schematic diagram of the structure of the motor provided in an embodiment of this application.
[0041] Please see Figure 1 , Figure 2 and Figure 3 The motor 100 includes a housing 1, a stator core 2, and a colloid (not shown in the figure, but understood with reference to the colloid filling area 4). The stator core 2 is disposed inside the housing 1, and a recess 21 is provided on the outer periphery of the stator core 2. The colloid is disposed between the outer periphery of the stator core 2 and the housing 1, and part of it is located in the recess 21.
[0042] In the technical solution of this application, a recessed portion 21 is provided on the outer periphery of the stator core 2, and a glue is filled between the stator core 2 and the housing 1, so that the glue fills the recessed portion 21. In this way, a mechanical lock is formed between the glue and the stator core 2, which can transmit torque more effectively, improve the connection strength between the stator core 2 and the housing 1, and meet the larger torque requirements.
[0043] Understandably, filling the recess 21 with colloid makes the connection between the stator core 2 and the housing 1 more stable, preventing the possibility of slight displacement of the stator core 2. This not only effectively suppresses the vibration of the stator core 2, but also improves the quietness of the motor 100 and its overall NVH (noise, vibration, and harshness) performance. In addition, the design of filling the recess 21 with colloid enhances the overall integrity of the structure, thereby improving its pressure resistance.
[0044] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The stator core 2 includes a stator yoke 22 and multiple stator teeth 23. The stator yoke 22 is arranged in a ring structure; the multiple stator teeth 23 are arranged along the circumference of the stator yoke 22 on the inner circumferential side of the stator yoke 22 (see also [reference]). Figure 6 In this embodiment, the recessed portion 21 is provided on the stator yoke 22, and in the circumferential direction of the stator core 2, the recessed portion 21 is staggered from each stator tooth 23. In these embodiments, since the recessed portion 21 is provided on the stator yoke 22 and staggered from each stator tooth 23, during the operation of the motor 100, the stator teeth 23 mainly bear stress such as electromagnetic force. If the recessed portion 21 coincides with or is too close to the stator tooth 23, stress concentration is likely to occur in these parts of the stator core 2 under stress. The staggered arrangement can make the stress more evenly distributed on the stator core 2, improve the structural stability of the stator core 2, and reduce the risk of local deformation or damage. Furthermore, the stator teeth 23 play a crucial role in the electromagnetic conversion process of the motor 100. Their position and structural integrity have a significant impact on the electromagnetic performance of the motor 100. The recessed portion 21 is staggered from the stator teeth 23, ensuring that the structure of the stator teeth 23 is not affected by the setting of the recessed portion 21, thereby maintaining the stability of the magnetic field distribution of the stator teeth 23, which helps the motor 100 to achieve stable electromagnetic conversion and improve the efficiency and performance of the motor 100.
[0045] In some embodiments, see Figure 1 , Figure 2 and Figure 3 A stator slot 24 for accommodating the stator winding is formed between two adjacent stator teeth 23. The recess 21 and the stator slot 24 are connected, so that the colloid portion is still located in the stator slot 24. In these embodiments, the connection between the recess 21 and the stator slot 24 allows the colloid to not only fill the recess 21 but also partially extend into the stator slot 24. The colloid in the stator slot 24 enhances the mechanical locking effect between the stator core 2 and the housing 1, further increasing the connection area and improving the connection strength, thus better meeting the requirements of larger torques.
[0046] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The motor 100 also includes an isolation sleeve 3, which is arranged in a ring structure. Multiple stator teeth 23 abut against the outer periphery of the isolation sleeve 3 along its circumference. Adhesive is disposed between the outer periphery of the isolation sleeve 3 and the housing 1. In these embodiments, the adhesive is disposed between the outer periphery of the isolation sleeve 3 and the housing 1. The isolation sleeve 3 provides a relatively regular adhesion surface for the adhesive. The isolation sleeve 3 assists in the sealing and filling of the adhesive, helping the adhesive to better fill the gap between the isolation sleeve 3 and the housing 1, forming a more complete connection structure. This not only increases the overall structural rigidity but also further strengthens the connection between the stator core 2 and the housing 1.
[0047] In some cases, the isolation sleeve 3 can be designed as a temporary component, removed after the colloid has cured for reuse. In this case, the isolation sleeve 3 is typically coated with a release agent on its contact surface. The release agent ensures that the colloid does not adhere to the isolation sleeve 3, facilitating subsequent removal. Once the colloid has fully cured, the isolation sleeve 3 can be easily removed and reused in the manufacturing process of other motors 100. This ensures high-quality colloid filling while achieving efficient material utilization and cost control. In other cases, the isolation sleeve 3 is permanently retained inside the motor 100 as part of the structure. This arrangement provides additional support for the stator teeth 23, significantly enhancing the mechanical strength and stability of the entire stator assembly.
[0048] In some embodiments, see Figure 3 , Figure 4 and Figure 5The stator core 2 includes multiple stacked stator laminations 25. Each stator lamination 25 includes two first stator laminations 251 located at the axial ends of the stator core 2, and a second stator lamination 252 sandwiched between the two first stator laminations 251. A recess 21 is provided on the second stator lamination 252. In these embodiments, placing the recess 21 on the middle second stator lamination 252 allows for a more even distribution of mechanical stress generated during operation, avoiding stress concentration on the first stator laminations 251 at both ends of the motor 100. This helps reduce the risk of localized deformation or damage and enhances the overall structural stability. Since the recess 21 is not on the outermost first stator lamination 251, the entire stator core 2 is more stable and precise during assembly. The absence of a recess on the first stator lamination 251 provides a flatter contact surface, facilitating precise docking with other components (such as the housing 1). Furthermore, it is understandable that the integral stator core 2 is usually a monolithic structure manufactured through processes such as casting or forging. To create recesses 21 on its surface, special processing techniques are required, such as machining or electrical discharge machining. These processing methods are relatively complex and difficult, and may affect the overall performance of the stator core 2, such as causing stress concentration and increased surface roughness. In these embodiments, however, the stator core 2 is formed by stacking multiple thin stator laminations 25. During the manufacturing process, recesses 21 can be punched out on individual stator laminations 25 using a stamping process. The stamping process is relatively simple and efficient, ensuring the dimensional and shape accuracy of the recesses 21, and does not significantly affect the overall performance of the stator core 2. This results in high production efficiency and low cost.
[0049] In some embodiments, see Figure 3 , Figure 4 and Figure 5The stator core 2 has multiple second stator laminations 252, some of which have recesses 21. In these embodiments, the stator core 2 is composed of multiple stacked stator laminations 25, including first stator laminations 251 located at both axial ends and multiple second stator laminations 252 sandwiched between two first stator laminations 251. Not all second stator laminations 252 have recesses 21; only some have recesses 21. By selectively providing recesses 21 on some second stator laminations 252, sufficient mechanical locking effect can be ensured while avoiding excessive weakening of the overall rigidity of the stator core 2. This helps to achieve a more uniform stress distribution and reduces the risk of deformation or damage due to insufficient local strength. Adjusting the number and position of the second stator laminations 252 with recesses 21 according to specific application requirements allows for flexible handling of different torque and vibration requirements. For example, recesses 21 are concentrated in areas where higher strength is required, while they are not provided in areas where lower strength is required, thereby optimizing overall performance.
[0050] In some embodiments, see Figure 3 , Figure 4 and Figure 5 In these embodiments, only one of any two adjacent second stator laminations 252 has a recess 21. That is, in any two adjacent second stator laminations 252, only one contains a recess 21, while the other does not. This arrangement effectively disperses stress points, avoiding localized stress concentration caused by the continuous placement of recesses 21. It helps to distribute mechanical stress more evenly, reducing the risk of structural deformation or damage. This helps maintain the overall rigidity and structural strength of the stator core 2, ensuring a stable connection while minimizing potential stress concentration problems, thereby improving the overall structural stability and reliability.
[0051] In some embodiments, see Figure 1 , Figure 2 , Figure 7 and Figure 8 The housing 1 has a groove 11 on the side facing the stator core 2. In these embodiments, the groove 11 on the side of the housing 1 facing the stator core 2 is filled with a colloid located between the outer periphery of the stator core 2 and the housing 1, forming a mechanical lock between the colloid and the housing 1, further improving the connection strength between the stator core 2 and the housing 1, and better meeting the larger torque requirements.
[0052] In some embodiments, see Figure 1 and Figure 2In the circumferential direction of the stator core 2, the grooves 11 and recesses 21 are staggered. In these embodiments, by staggering the grooves 11 and recesses 21 circumferentially, stress concentration in a specific area can be avoided. This arrangement helps to distribute mechanical stress more evenly, reducing the risk of structural deformation or damage caused by local stress concentration, thereby improving the stability and durability of the overall structure. The colloid not only fills the recesses 21 but also the grooves 11. The staggered arrangement of the recesses 21 and grooves 11 forms a more complex mechanical locking structure, further enhancing the connection strength between the stator core 2 and the housing 1, ensuring that the motor 100 can operate stably even under high torque conditions.
[0053] In some embodiments, see Figure 7 and Figure 8 The groove 11 extends axially along the stator core 2, and its radial cross-section is arc-shaped. In these embodiments, the arc-shaped cross-section of the groove 11 allows for more even stress distribution under load, and the arc-shaped edges avoid sharp corners, which are often stress concentration points. Therefore, the arc-shaped design significantly reduces local stress peaks, reduces structural fatigue and potential damage risks, and by reducing stress concentration, the overall structure of the motor 100 is more stable and its durability is enhanced, thereby extending the service life of the motor 100. Furthermore, the absence of sharp corners in the arc-shaped groove 11 reduces the resistance of the colloid during flow, allowing it to flow more smoothly into the groove 11 and improving filling efficiency. Moreover, the colloid spreads and wets more easily on the surface of the arc-shaped groove 11, thus better filling the groove 11 and avoiding problems such as insufficient filling or air bubbles. This ultimately forms a tighter and more complete mechanical interlocking structure, improving the bonding strength between the colloid and the housing 1 and enhancing the overall mechanical connection performance.
[0054] In some embodiments, see Figure 7 and Figure 8 The groove 11 extends axially along the stator core 2, from one end of the stator core 2 towards the other, and the cross-sectional area of the groove 11 gradually decreases. Understandably, the ends of the housing typically require encapsulation. If the cross-section of the groove 11 remains constant, stress concentration points will form at the ends of the housing, leading to localized overload or even structural damage. In these embodiments, by designing the groove 11 to gradually decrease in cross-sectional area, stress is distributed more evenly over a longer area, avoiding stress concentration at one end and improving the overall reliability and durability of the structure.
[0055] According to a second aspect of this application, a powertrain is provided, including a motor 100. The structure of the motor 100 is as described above. Since this powertrain adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0056] According to a third aspect of this application, a vehicle is provided, including an electric motor 100 or a powertrain. The structure of the electric motor 100 or the powertrain is as described above. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0057] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.
[0058] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0059] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0060] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.
[0061] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. An electric motor, characterized in that, include: chassis; A stator core is disposed inside the housing, and a recess is provided on the outer periphery of the stator core; as well as, The colloid is disposed between the outer periphery of the stator core and the housing, and is partially located in the recess.
2. The motor according to claim 1, characterized in that, The stator core includes: The stator yoke is arranged in a ring structure; and, Multiple stator teeth, wherein the multiple stator teeth are arranged circumferentially on the inner circumferential side of the stator yoke; The recessed portion is provided on the stator yoke, and in the circumferential direction of the stator core, the recessed portion is staggered from each stator tooth.
3. The motor according to claim 2, characterized in that, A stator slot for accommodating the stator winding is formed between two adjacent stator teeth, and the recessed portion is connected to the stator slot so that the colloid portion is still located in the stator slot.
4. The motor according to claim 3, characterized in that, The motor also includes an isolation sleeve, which is arranged in a ring structure; The stator teeth abut against the outer periphery of the isolation sleeve along the circumferential direction, and the colloid is disposed between the outer periphery of the isolation sleeve and the housing.
5. The motor according to claim 1, characterized in that, The stator core includes multiple stator laminations stacked together. The multiple stator laminations include two first stator laminations located at the axial ends of the stator core, and a second stator lamination sandwiched between the two first stator laminations. The recessed portion is provided in the second stator lamination.
6. The motor according to claim 5, characterized in that, The second stator laminations are provided in multiple portions, and some of the second stator laminations are provided with the recessed portions.
7. The motor according to claim 6, characterized in that, One of any two adjacent second stator laminations is provided with the recessed portion.
8. The motor according to any one of claims 1 to 7, characterized in that, The housing has a groove on the side facing the stator core.
9. The motor according to claim 8, characterized in that, The grooves and recesses are staggered in the circumferential direction of the stator core.
10. The motor according to claim 8, characterized in that, The groove extends along the axial direction of the stator core, and the cross-section of the groove along the radial direction of the stator core is arc-shaped.
11. The motor according to claim 8, characterized in that, The groove extends along the axial direction of the stator core, from one end of the stator core towards the other end, and the cross-sectional area of the groove is gradually reduced.
12. A powertrain, characterized in that, Includes the motor as described in any one of claims 1 to 11.
13. A vehicle, characterized in that, Includes the motor as described in any one of claims 1 to 11 or the powertrain as described in claim 12.