Amorphous stator core and electric machine
By designing the axial fixation of the amorphous motor stator core and setting up the magnetic permeability adjustment groove, the problem of magnetic performance degradation caused by radial stress was solved, achieving efficient fixation of amorphous materials and improving motor performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZEEKR INTELLIGENT TECH CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-24
AI Technical Summary
The magnetic properties of the stator core of an amorphous motor decrease and iron loss increases under radial compressive stress, which affects the performance of the stator core.
An axially fixed design is adopted, which reduces radial stress by setting at least four mounting ears on the outer periphery of the yoke of the stator body and fixing them to the connector through axially penetrating mounting holes, and increases magnetic permeability adjustment grooves to balance magnetic flux.
It reduces the radial stress of the stator body, avoids the deterioration of the magnetic properties of amorphous materials, reduces the torque fluctuation and NVH performance degradation of the motor, and improves the overall energy efficiency and production efficiency of the motor.
Smart Images
Figure CN224555288U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor technology, and more specifically, to an amorphous stator core and a motor. Background Technology
[0002] Amorphous motors are motors that use amorphous materials as their core, and are characterized by high efficiency, energy saving, and environmental friendliness.
[0003] In related technologies, the stator core of amorphous motors is usually fixed by interference fit press fitting, that is, the stator core is directly pressed into the motor housing. At this time, the stator core will be subjected to radial compressive stress. Under radial compressive stress, the magnetic properties of amorphous materials decrease and iron loss increases, affecting the performance of the stator core. Utility Model Content
[0004] This application provides an amorphous stator core and motor, which can reduce the radial stress on the stator body and avoid the deterioration of magnetic properties of amorphous materials due to mechanical stress.
[0005] In a first aspect, this application provides an amorphous stator core, comprising:
[0006] A stator body having a yoke;
[0007] At least four mounting ears are spaced apart on the outer periphery of the yoke, and each mounting ear is provided with a mounting hole and a magnetic permeability adjustment groove;
[0008] The mounting hole extends through the mounting ear along the axial direction of the stator body, and the magnetic permeability adjustment groove extends through the mounting ear along the axial direction of the stator body, with the magnetic permeability adjustment groove extending from the outer edge of the mounting ear toward the mounting hole.
[0009] In an optional embodiment, the magnetic permeability adjustment groove is in communication with the mounting hole.
[0010] In an optional embodiment, the magnetic adjustment groove extends through the edge of the mounting ear.
[0011] In an optional embodiment, the thickness direction of the mounting ear is parallel to the axial direction of the stator body.
[0012] In an optional embodiment, the central axis of the magnetic permeability adjustment groove along its groove length is collinear with the center of the mounting hole.
[0013] In an optional embodiment, the central axis of the magnetic permeability adjustment slot along its slot length is collinear with the center of the stator body.
[0014] In an optional embodiment, the stator body includes a plurality of stator laminations stacked along the central axis of the stator body, and each stator lamination is provided with the mounting lug.
[0015] In an optional embodiment, the mounting lug and the stator lamination are integrally formed.
[0016] In an optional embodiment, the mounting ear further includes a connecting portion connected to the yoke, the connecting portion having a magnetic permeability adjustment hole that extends through the connecting portion along its thickness direction.
[0017] In an optional embodiment, the number of magnetic permeability adjustment holes is multiple, and the multiple magnetic permeability adjustment holes are arranged at circumferential intervals along the yoke.
[0018] In an optional embodiment, the at least four mounting ears are non-uniformly distributed along the outer periphery of the yoke.
[0019] Secondly, this application provides an electric motor, comprising:
[0020] A housing; a rotor assembly rotatably connected to the housing; an amorphous stator core as described in any of the preceding claims, the amorphous stator core being arranged around the outer periphery of the rotor assembly and fixed to the housing through the mounting holes.
[0021] The amorphous stator core and motor provided in this application have at least the following advantages:
[0022] This design employs an axial fixing mechanism, with at least four mounting ears on the outer periphery of the yoke portion of the stator body. Connectors are inserted through axially penetrating mounting holes to fix the stator core to the motor housing along the axial direction. This method transfers the fixing force from radial to axial, significantly reducing the radial stress on the stator body and preventing magnetic performance degradation of the amorphous material due to mechanical stress.
[0023] Furthermore, due to the addition of at least four mounting lugs to the stator body, the amorphous stator core will have magnetic flux at the mounting lugs. This reduces the rate of change of magnetic permeability in the yoke, leading to increased torque fluctuations and stator slot torque in the motor, and deterioration of NVH (noise, vibration, and harshness) performance. Therefore, in this solution, by providing magnetic permeability adjustment slots that penetrate along the thickness direction at the mounting lugs, the magnetic flux passing through the yoke can be reduced, thereby balancing the effects of adding mounting lugs. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of an amorphous stator core as shown in one embodiment;
[0025] Figure 2 This is a partial schematic diagram of the amorphous stator core at the mounting lug as described in one embodiment;
[0026] Figure 3 This is a schematic diagram of the structure of an amorphous stator core as shown in another embodiment.
[0027] Explanation of reference numerals in the attached figures:
[0028] 10. Stator body; 11. Yoke; 12. Tooth; 13. Stator slot; 20. Mounting ear; 21. Mounting hole; 22. Magnetic permeability adjustment slot; 23. Magnetic permeability adjustment hole; 24. Connecting part; 25. First mounting ear; 26. Second mounting ear; 27. Third mounting ear; 28. Fourth mounting ear. Detailed Implementation
[0029] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0030] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.
[0031] This application provides an amorphous stator core and a motor, which will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.
[0032] Please refer to Figure 1 and Figure 2 This application provides an amorphous stator core, which is a stator made of amorphous material. Amorphous material refers to amorphous alloy (also known as metallic glass), which is a type of solid metallic material with long-range disordered atomic arrangement. For details, please refer to related technologies. This application does not limit the specific composition of the amorphous material.
[0033] The amorphous stator core includes a stator body 10 and at least four mounting lugs 20.
[0034] The stator body 10 has a yoke 11 and a plurality of teeth 12 located on the inner periphery of the yoke 11. The plurality of teeth 12 are evenly distributed circumferentially along the yoke 11 and extend along the center of the stator body 10. A stator slot 13 is formed between two adjacent teeth 12, and the stator slot 13 is used for winding. When alternating current is applied to the winding, the generated alternating magnetic flux interacts with the magnetic flux generated by the rotor assembly, enabling the rotor assembly to rotate relative to the stator assembly.
[0035] At least four mounting ears 20 are spaced apart on the outer periphery of the yoke 11. Each mounting ear 20 has a mounting hole 21 and a magnetic permeability adjustment groove 22. The mounting hole 21 extends through the mounting ear 20 along the axial direction of the stator body 10 and is used to pass a connector, which may be, but is not limited to, bolts or screws, to fix the amorphous stator core axially. The magnetic permeability adjustment groove 22 extends through the mounting ear 20 along the axial direction of the stator body 10 and extends from the outer edge of the mounting ear 20 toward the mounting hole 21.
[0036] It is easy to understand that the traditional interference fit press-fit method fixes the stator core in the housing through radial pressure, causing magnetic domain distortion in the amorphous material due to radial compressive stress, resulting in decreased magnetic permeability and increased iron loss. This solution adopts an axial fixing design, with at least four mounting lugs 20 provided on the outer periphery of the yoke 11 of the stator body 10. Connectors are inserted through axially penetrating mounting holes 21 to fix the stator core to the motor housing axially. This method transfers the fixing force from radial to axial, significantly reducing the radial stress on the stator body 10 and preventing magnetic performance degradation of the amorphous material due to mechanical stress.
[0037] Furthermore, due to the addition of at least four mounting ears 20 to the stator body 10, the amorphous stator core will have magnetic flux at the mounting ears 20. This reduces the magnetic flux through the yoke 11, lowers the rate of change of magnetic permeability of the yoke 11, and leads to torque fluctuations in the motor and increased torque in the stator slot 13, resulting in deterioration of NVH (noise, vibration, and harshness) performance. Therefore, in this solution, by providing a magnetic permeability adjustment groove 22 that extends axially through the stator body 10 at the mounting ears 20, the magnetic flux passing through the mounting ears 20 can be reduced, thereby balancing the effects of adding the mounting ears 20.
[0038] In one embodiment, the thickness direction of the mounting ear 20 is parallel to the axial direction of the stator body 10. This means that the extension direction of the mounting hole 21 is also parallel to the thickness direction of the mounting ear 20. When bolts or other fasteners are used to fix the mounting ear through the mounting hole 21, the nut of the bolt or the nut of the screw will contact the plane of the mounting ear, making the force more uniform and improving the connection stability.
[0039] In one embodiment, the magnetic permeability adjustment groove 22 communicates with the mounting hole 21, and the magnetic permeability adjustment groove 22 extends through the edge of the mounting ear 20, that is, the mounting ear 20 is disconnected at the magnetic permeability adjustment groove 22.
[0040] With this configuration, the mounting ear 20 is divided into two isolated parts by the magnetic permeability adjustment groove 22, forming a "magnetic circuit break" at the mounting ear 20. The magnetic flux that might have passed through the mounting ear 20 is forced to detour to the main body area of the yoke 11, reducing the amount of magnetic flux flowing through the mounting ear 20. This can effectively prevent the yoke 11 from becoming magnetically saturated due to the concentration of magnetic flux and maintain the high permeability characteristics of the amorphous material.
[0041] Of course, in some other embodiments, the magnetic permeability adjustment groove 22 may only extend through the edge of the mounting ear 20, or the magnetic permeability adjustment groove 22 may only communicate with the mounting ear 20, which will not be described in detail here.
[0042] Furthermore, the formation of the aforementioned magnetic permeability adjustment groove 22 is not limited. For example, the magnetic permeability adjustment groove 22 can be circular, square, strip-shaped, or a combination of curved and straight shapes, but is not limited to these.
[0043] In one embodiment, the central axis of the magnetic permeability adjustment groove 22 along its groove length direction is collinear with the center of the stator body 10. Here, "groove length direction" refers to the length extension direction of the magnetic permeability adjustment groove 22, and may also refer to the depth direction of the magnetic permeability adjustment groove 22 when the magnetic permeability adjustment groove 22 is not connected to the mounting hole 21.
[0044] With this configuration, the magnetic permeability adjustment groove 22 forms a reluctance structure at the mounting ear 20 with the mounting hole 21 as the symmetrical point. For example, when the motor is running, as the alternating magnetic flux diffuses from the yoke 11 to the mounting ear 20, it will be uniformly resisted due to the radially symmetrical distribution of the magnetic permeability adjustment groove 22, preventing the magnetic flux from concentrating in one direction. It is easy to understand that if the central axis of the magnetic permeability adjustment groove 22 deviates from the center of the mounting hole 21, it may cause uneven magnetic reluctance on both sides of the mounting hole 21, leading to local magnetic saturation. The collinear design ensures that the magnetic permeability adjustment groove 22 has the same effect on the magnetic reluctance on both sides of the mounting hole 21.
[0045] Furthermore, the central axis of the magnetic permeability adjustment slot 22 along its length is collinear with the center of the stator body 10. Similarly, because the central axis of the magnetic permeability adjustment slot 22 is collinear with the center of the stator body 10, the magnetic flux distribution between the yoke 11 and the mounting lug 20 is more uniform. This not only reduces the probability of local magnetic saturation but also reduces the increase in iron loss caused by magnetic saturation of amorphous materials, thereby improving the overall energy efficiency of the motor.
[0046] In one embodiment, the stator body 10 includes stator laminations stacked along the central axis of the stator body 10, each stator lamination having a mounting lug 20. Multiple stator laminations can be fixed together by processes such as press-fitting or welding to form an integral structure with sufficient rigidity; alternatively, the stator laminations can be manufactured by winding or stamping processes, but are not limited to these methods.
[0047] In this way, each stator lamination is independently equipped with a mounting lug 20, allowing the axial fixing force to be evenly transmitted to each layer of stator laminations through connectors (such as bolts), avoiding localized stress concentration. Amorphous materials are inherently brittle, and uniform stress distribution can reduce the risk of stator lamination breakage or deformation caused by mechanical stress.
[0048] Furthermore, the mounting ear 20 is integrally formed with the stator lamination.
[0049] In this way, the one-piece molding avoids the seams that occur when the mounting lug 20 is connected to the stator lamination by welding, riveting, or other methods, thus eliminating the risk of fracture due to stress concentration. Furthermore, the one-piece molding directly forms the mounting lug 20 on the stator lamination using a stamping die, eliminating the need for separate machining of the mounting lug 20 parts and subsequent assembly processes, which helps to improve production efficiency.
[0050] In one embodiment, at least four mounting ears 20 are non-uniformly distributed along the outer periphery of the yoke 11. Non-uniform distribution here means that the intervals between adjacent mounting ears 20 are not equal in angle or spacing.
[0051] It is easy to understand that if the mounting ears 20 are evenly distributed, the magnetic permeability of the yoke 11 will fluctuate regularly due to the periodicity of the mounting ears 20, leading to an increase in electromagnetic force harmonics during motor operation, which in turn causes torque fluctuations and vibration noise (NVH). This solution breaks the circumferential symmetry of the mounting ears 20, thereby disrupting the periodicity of the magnetic permeability changes, reducing the low-order harmonic components in the electromagnetic force, thus reducing the torque fluctuation amplitude and improving the vibration and noise performance of the motor.
[0052] like Figure 3 In the embodiment shown, there are four mounting ears 20, namely a first mounting ear 25, a second mounting ear 26, a third mounting ear 27 and a fourth mounting ear 28. The second mounting ear 26 is located between the first mounting ear 25 and the fourth mounting ear 28, and the third mounting ear 27 is located between the second mounting ear 26 and the fourth mounting ear 28.
[0053] The angle between the first mounting ear 25 and the second mounting ear 26 is the first angle; the angle between the second mounting ear 26 and the third mounting ear 27 is the second angle; the angle between the third mounting ear 27 and the fourth mounting ear 28 is the third angle; and the angle between the fourth mounting ear 28 and the first mounting ear 25 is the fourth angle. The first angle is different from the second angle, and the sum of the first angle and the second angle is 180°. The first angle is equal to the third angle, and the second angle is equal to the fourth angle.
[0054] In this way, since the first angle is equal to the third angle and the second angle is equal to the fourth angle, the mounting ear 20 is arranged in a mirror symmetry (for example, the first angle, the second angle, the third angle and the fourth angle are 100°, 80°, 100° and 80° respectively, but not limited to this), which not only preserves the geometric symmetry to balance the mechanical force, but also breaks the periodicity of magnetic permeability change through the angle difference (100°≠80°).
[0055] In one embodiment, the mounting ear 20 further includes a connecting portion 24 connected to the yoke 11. The connecting portion 24 is provided with a magnetic permeability adjustment hole 23, which penetrates the connecting portion 24 along its thickness direction.
[0056] In this way, the magnetic permeability adjustment hole 23 reduces the effective core cross-sectional area of the connecting part 24, thereby reducing the magnetic flux passing through the connecting part 24 and allowing more magnetic flux to pass through the yoke 11 of the stator body 10. This avoids magnetic saturation caused by abrupt changes in the magnetic circuit at the connection between the mounting ear 20 and the yoke 11, thereby reducing the iron loss of the amorphous stator core.
[0057] In one embodiment, there are multiple magnetic permeability adjustment holes 23, which are spaced apart circumferentially along the yoke 11.
[0058] Thus, the circumferential arrangement of multiple magnetic permeability adjustment holes 23 can form a continuous magnetic permeability weakening region in the connecting portion 24, further enhancing the suppression effect on magnetic shunting. Moreover, compared to a single large hole, multiple magnetic permeability adjustment holes 23 can reduce excessive weakening of the mechanical strength of the connecting portion 24.
[0059] In the embodiment shown in the figure, the magnetic permeability adjustment hole 23 is a circular hole, and there are three magnetic permeability adjustment holes 23. The three magnetic permeability adjustment holes 23 are evenly distributed along the axial direction of the yoke 11. However, in other embodiments, the number of magnetic permeability adjustment holes 23 may be two or more (more than three), and the shape of the magnetic permeability adjustment holes 23 may be strip-shaped, elliptical, waist-shaped, etc., but is not limited to these.
[0060] Secondly, this application also provides an electric motor, which includes a housing, a rotor assembly, and an amorphous stator core as described in any of the above embodiments or implementations. The amorphous stator core is disposed around the outer periphery of the rotor assembly and is fixed to the housing through mounting holes 21 on mounting lugs 20. Specifically, bolts can be inserted into the mounting holes 21, and the housing may have threaded holes. Bolts pass through the mounting holes 21 and the threaded holes to fix the amorphous stator core to the housing, but this is not limited to these provisions.
[0061] The aforementioned motor can be applied to vehicles, which can be cars, trucks, vans, SUVs, or any other type of vehicle equipped with a battery. In one embodiment, the vehicle is a high-voltage traction battery-powered electric vehicle (e.g., a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), etc.). In another embodiment, the vehicle is an autonomous vehicle, wherein the vehicle's maneuverability is controlled without direct input from a human driver.
[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. An amorphous stator core, characterized in that, include: A stator body having a yoke; At least four mounting ears are spaced apart on the outer periphery of the yoke, and each mounting ear is provided with a mounting hole and a magnetic permeability adjustment groove; The mounting hole extends through the mounting ear along the axial direction of the stator body, and the magnetic permeability adjustment groove extends through the mounting ear along the axial direction of the stator body, with the magnetic permeability adjustment groove extending from the outer edge of the mounting ear toward the mounting hole.
2. The amorphous stator core according to claim 1, characterized in that, The magnetic permeability adjustment groove is connected to the mounting hole; And / or, the magnetic adjustment groove extends through the edge of the mounting ear; And / or, the thickness direction of the mounting ear is parallel to the axial direction of the stator body.
3. The amorphous stator core according to claim 1, characterized in that, The central axis of the magnetic permeability adjustment groove along its length is collinear with the center of the mounting hole.
4. The amorphous stator core according to claim 3, characterized in that, The central axis of the magnetic permeability adjustment groove along its length is collinear with the center of the stator body.
5. The amorphous stator core according to any one of claims 1 to 4, characterized in that, The stator body includes a plurality of stator laminations stacked along the central axis of the stator body, and each stator lamination is provided with the mounting lug.
6. The amorphous stator core according to claim 5, characterized in that, The mounting ear and the stator lamination are integrally formed.
7. The amorphous stator core according to any one of claims 1 to 4, 6, characterized in that, The mounting ear also includes a connecting portion connected to the yoke, the connecting portion having a magnetic permeability adjustment hole that extends through the connecting portion along its thickness direction.
8. The amorphous stator core according to claim 7, characterized in that, The number of magnetic permeability adjustment holes is multiple, and the multiple magnetic permeability adjustment holes are arranged at intervals along the circumference of the yoke.
9. The amorphous stator core according to any one of claims 1 to 4, 6, and 8, characterized in that, The at least four mounting ears are non-uniformly distributed along the outer periphery of the yoke.
10. An electric motor, characterized in that, include: case; The rotor assembly is rotatably connected to the housing; The amorphous stator core as described in any one of claims 1 to 9, wherein the amorphous stator core is disposed around the outer periphery of the rotor assembly and is fixed to the housing through the mounting holes.