Rotor lamination, rotor structure and electric machine
Patent Information
- Application Number
- CN202522183541.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-10-15
AI Technical Summary
[0005]本实用新型的主要目的在于提供一种转子冲片、转子结构及电机，以解决相关技术中的永磁同步电机的磁钢容易退磁的技术问题
[0016]应用本实用新型的技术方案的转子冲片上设有槽结构，槽结构包括：磁钢槽，磁钢槽贯穿转子冲片设置；隔磁槽，隔磁槽贯穿转子冲片设置，隔磁槽设置于磁钢槽的端部，隔磁槽与磁钢槽连通；第一凸起和第二凸起，第一凸起和第二凸起设置于磁钢槽和隔磁槽之间，沿着磁钢槽的宽度方向，第一凸起和第二凸起对应地设置于磁钢槽的相对的两个内侧壁，第一凸起和第二凸起相向地凸起设置。采用上述结构设计的转子冲片，在磁钢槽和隔磁槽之间的位置设置了第一凸起和第二凸起，且沿着磁钢槽的宽度方向，第一凸起和第二凸起相向凸起设置，即两者相向延伸，当磁钢安装于磁钢槽内时，磁钢的两个角部便会与第一凸起和第二凸起对应地接触。当采用该转子冲片的电机工作时，由于第一凸起和第二凸起的存在，会改变磁钢角部的反向磁场分部，使得磁钢角部的反向磁场更分散，减小磁钢角部反向磁场密度，从而减小对磁钢角部磁畴排列的破坏，降低磁钢角部区域的退磁风险，通过针对磁钢易退磁的角部位置进行设计优化，使得磁钢角部不易退磁，进而使得磁钢整体具有更好的抗退磁能力，解决了相关技术中的永磁同步电机的磁钢容易退磁的技术问题。
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Figure CN224909185U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor design technology, and more specifically, to a rotor lamination, rotor structure, and motor. Background Technology
[0002] In permanent magnet synchronous motors, irreversible demagnetization of the magnets can easily occur when the motor operates under conditions such as high temperature and high current. To prevent this, related technologies typically use permanent magnet materials with high coercivity and large thickness. However, this approach increases the manufacturing cost of the motor, and demagnetization can still occur after prolonged use.
[0003] It is evident that permanent magnet synchronous motors in related technologies suffer from the technical problem of easy demagnetization of the magnets. Currently, no effective solution has been proposed to address this issue.
[0004] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content
[0005] The main purpose of this utility model is to provide a rotor lamination, rotor structure and motor to solve the technical problem of easy demagnetization of magnets in permanent magnet synchronous motors in related technologies.
[0006] To achieve the above objectives, according to one aspect of the present invention, a rotor lamination is provided, the rotor lamination having a slot structure, the slot structure comprising: a magnet slot, the magnet slot penetrating the rotor lamination; a magnetic isolation slot, the magnetic isolation slot penetrating the rotor lamination and disposed at the end of the magnet slot, the magnetic isolation slot communicating with the magnet slot; a first protrusion and a second protrusion, the first protrusion and the second protrusion being disposed between the magnet slot and the magnetic isolation slot, the first protrusion and the second protrusion being correspondingly disposed on two opposite inner sidewalls of the magnet slot along the width direction of the magnet slot, the first protrusion and the second protrusion being protruding towards each other.
[0007] Furthermore, the groove structure satisfies: 0.2≤(h1+h2) / H≤0.7; where h1 is the height of the first protrusion along the width direction of the magnet groove, h2 is the height of the second protrusion along the width direction of the magnet groove, and H is the width of the magnet groove.
[0008] Furthermore, the magnet slot has a V-shaped structure, with the opening direction of the V-shaped structure facing away from the center of the rotor lamination. There are two magnetic isolation slots, which are arranged one-to-one at both ends of the magnet slot. There are two first protrusions and two second protrusions. For any magnetic isolation slot, there is a first protrusion and a second protrusion between it and the magnet slot.
[0009] Furthermore, the magnetic steel trough includes a first trough segment and a second trough segment, which are arranged at an angle to form a V-shaped structure. The trough structure also includes a third protrusion, which is disposed on the inner sidewall of the magnetic steel trough and protrudes towards the inside of the magnetic steel trough. The third protrusion is located between the first trough segment and the second trough segment.
[0010] Furthermore, the groove structure satisfies: 0.2≤h3 / H≤0.8; where h3 is the height of the third protrusion and H is the width of the magnetic groove.
[0011] Furthermore, the third protrusion is located on the side wall of the magnet slot away from the center of the rotor lamination. The third protrusion is convex toward the center of the rotor lamination, and the width of the third protrusion gradually increases along the protrusion direction.
[0012] Furthermore, the magnetic steel trough includes a first trough segment and a second trough segment, which are arranged at an angle to form a V-shaped structure. The trough structure also includes a partition, which is located between the first trough segment and the second trough segment, and the partition separates the first trough segment and the second trough segment from each other.
[0013] Furthermore, the structure of the rotor lamination satisfies: 8mm≤H*P≤10mm; where H is the width of the magnet slot, P is the number of pole pairs of the motor using the rotor lamination; and / or, there are multiple slot structures, which are arranged sequentially at intervals along the circumference of the rotor lamination.
[0014] According to another aspect of the present invention, a rotor structure is provided, the rotor structure comprising: a rotor core, the rotor core comprising a plurality of rotor laminations stacked sequentially, wherein the rotor laminations are the aforementioned rotor laminations, and the slot structures of the plurality of rotor laminations are correspondingly arranged; and magnets, the magnets being disposed within the magnet slots of the plurality of rotor laminations, wherein the ends of the magnets are in contact with at least a first protrusion and a second protrusion of a portion of the rotor laminations.
[0015] According to another aspect of the present invention, an electric motor is provided, the electric motor including a rotor structure and a stator structure, wherein the rotor structure is rotatably mounted within the stator structure, and the rotor structure is the rotor structure described above.
[0016] The rotor lamination using the technical solution of this utility model has a slot structure, which includes: a magnet slot, which penetrates the rotor lamination; a magnetic isolation slot, which penetrates the rotor lamination and is located at the end of the magnet slot, communicating with the magnet slot; and a first protrusion and a second protrusion, which are located between the magnet slot and the magnetic isolation slot. Along the width direction of the magnet slot, the first protrusion and the second protrusion are correspondingly located on two opposite inner sidewalls of the magnet slot, and the first protrusion and the second protrusion protrude towards each other. With the rotor lamination designed using the above structure, the first protrusion and the second protrusion are located between the magnet slot and the magnetic isolation slot, and along the width direction of the magnet slot, the first protrusion and the second protrusion protrude towards each other, that is, they extend towards each other. When the magnet is installed in the magnet slot, the two corners of the magnet will contact the first protrusion and the second protrusion respectively. When the motor using this rotor lamination is in operation, the presence of the first and second protrusions alters the distribution of the reverse magnetic field at the corner of the magnet, making the reverse magnetic field at the corner more dispersed and reducing the density of the reverse magnetic field at the corner. This reduces the disruption to the magnetic domain arrangement at the corner and lowers the risk of demagnetization in the corner region. By optimizing the design for the corner positions where magnets are prone to demagnetization, the corners of the magnets are less prone to demagnetization, thus giving the magnets as a whole better resistance to demagnetization. This solves the technical problem of easy demagnetization of magnets in permanent magnet synchronous motors in related technologies. Attached Figure Description
[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of an embodiment of the rotor lamination of this utility model; Figure 2 for Figure 1 A magnified structural diagram of a local area in the middle (some structural parameters are shown in the diagram); Figure 3 This is a schematic diagram of one embodiment of the rotor structure of this utility model; Figure 4 for Figure 3 A magnified structural diagram of a local area in the middle (some structural parameters are shown in the diagram); Figure 5 This is a schematic diagram of another embodiment of the rotor structure of this utility model; Figure 6 This is a schematic diagram of the structure of an embodiment of the motor of this utility model; Figure 7 This is a schematic diagram comparing the demagnetizing area ratio and demagnetizing current of motors in related technologies and motors using rotor laminations of this utility model embodiment. Figure 8 This diagram illustrates a comparison of the demagnetizing current and motor cost between motors in related technologies and motors using rotor laminations according to embodiments of this utility model.
[0018] The above figures include the following reference numerals: 1. Rotor laminations; 2. Magnet; 11. Magnetic steel groove; 12. Magnetic isolation groove; 13. First protrusion; 14. Second protrusion; 15. Third protrusion; 16. Divider; 10. Rotor structure; 20. Stator structure. Detailed Implementation
[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0020] Please refer to Figures 1 to 6 In order to solve the technical problems described in the background section, the embodiments of this utility model provide a rotor lamination, a rotor structure, and a motor.
[0021] The applicant discovered that the corners of the magnets in the motor are prone to demagnetization during operation. Further analysis by the applicant suggests that the corners of the magnets are located at geometric abrupt changes, where magnetic field lines are highly concentrated, forming localized strong magnetic field regions. When the motor is under load, the reverse magnetic field generated by the armature reaction violently cancels out the magnetic field of the magnets at the corners. At this time, the reverse magnetic field generated by the stator current penetrates deeper into the corners of the magnets, easily weakening the stability of the magnetic domain arrangement on the magnet surface. Since the demagnetization curve of magnets (such as neodymium iron boron permanent magnets) has a critical inflection point, the corners of the magnets, due to the higher intensity of the reverse magnetic field, are more likely to exceed this inflection point, leading to irreversible demagnetization at the corners.
[0022] This utility model embodiment provides a rotor lamination with a slot structure, the slot structure including: a magnet slot 11, the magnet slot 11 penetrating the rotor lamination; a magnetic isolation slot 12, the magnetic isolation slot 12 penetrating the rotor lamination and disposed at the end of the magnet slot 11, the magnetic isolation slot 12 communicating with the magnet slot 11; a first protrusion 13 and a second protrusion 14, the first protrusion 13 and the second protrusion 14 disposed between the magnet slot 11 and the magnetic isolation slot 12, the first protrusion 13 and the second protrusion 14 being correspondingly disposed on two opposite inner sidewalls of the magnet slot 11 along the width direction of the magnet slot 11, the first protrusion 13 and the second protrusion 14 protruding towards each other.
[0023] The rotor lamination with the above-described structure has a first protrusion 13 and a second protrusion 14 positioned between the magnet slot 11 and the magnetic isolation slot 12. These protrusions face each other along the width of the magnet slot 11, meaning they extend towards each other. When the magnet 2 is installed in the magnet slot 11, its two corners will contact the first protrusion 13 and the second protrusion 14. When the motor using this rotor lamination operates, the presence of the first protrusion 13 and the second protrusion 14 alters the distribution of the reverse magnetic field at the corners of the magnet 2, making the reverse magnetic field more dispersed and reducing its density. This reduces the disruption to the magnetic domain arrangement at the corners and lowers the risk of demagnetization in the corner region. By optimizing the design for the corners of the magnet 2, which are prone to demagnetization, the corners of the magnet 2 are less susceptible to demagnetization, resulting in better overall demagnetization resistance for the magnet 2. This solves the technical problem of easy demagnetization of magnets in permanent magnet synchronous motors in related technologies.
[0024] Specifically, the shape of the magnetic groove 11 can be V-shaped or straight.
[0025] In this embodiment, the heights of the first protrusion 13 and the second protrusion 14 were further optimized to ensure that the slot structure satisfies: 0.2 ≤ (h1 + h2) / H ≤ 0.7; where h1 is the protrusion height of the first protrusion 13 along the width direction of the magnet slot 11, h2 is the protrusion height of the second protrusion 14 along the width direction of the magnet slot 11, and H is the width of the magnet slot 11. The applicant found that when the protrusion heights of the first protrusion 13 and the second protrusion 14 are too low, their impact on the distribution of the reverse magnetic field at the corner of the magnet 2 is relatively small. In this case, it may be impossible to optimize the magnetic field distribution density at the corner of the magnet 2, thus failing to improve the concentration of the reverse magnetic field at the corner of the magnet 2, making the corner of the magnet 2 prone to demagnetization. When the protrusion heights of the first protrusion 13 and the second protrusion 14 are too large, it easily increases magnetic leakage, adversely affecting motor efficiency. In this embodiment, by designing the protrusion height of the first protrusion 13 and the second protrusion 14 to be 0.2≤(h1+h2) / H≤0.7, the above two situations can be effectively avoided, and the anti-demagnetization ability of the corner of the magnet 2 can be improved while ensuring motor efficiency.
[0026] In one specific embodiment, the magnet slot 11 has a V-shaped structure, with the opening of the V-shape facing away from the center of the rotor lamination. There are two magnetic isolation slots 12, each corresponding to one end of the magnet slot 11. There are also two first protrusions 13 and two second protrusions 14. For any one magnetic isolation slot 12, there is a first protrusion 13 and a second protrusion 14 between it and the magnet slot 11. Figure 3 and Figure 4As shown, the magnetic steel groove 11 includes a first groove segment and a second groove segment. The first groove segment and the second groove segment are set at an angle to form a V-shaped structure. A magnet 2 is installed in the first groove segment and the second groove segment respectively. When the motor is in use, the corners of the two opposing ends of the two magnets 2 are prone to demagnetization due to the concentration of reverse magnetic fields. By setting a first protrusion 13 and a second protrusion 14 between the magnetic steel groove 11 and the two magnetic isolation grooves 12, the anti-demagnetization optimization can be performed on both opposing ends of the two magnets 2, so that the reverse magnetic field density at the corners of the two opposing ends of the two magnets 2 is reduced, and the risk of corner demagnetization is reduced.
[0027] Based on the above structural design, the groove structure of this embodiment further includes a third protrusion 15. The third protrusion 15 is disposed on the inner sidewall of the magnet groove 11 and protrudes towards the interior of the magnet groove 11. The third protrusion 15 is located between the first groove segment and the second groove segment. By setting the third protrusion 15, the distribution of the reverse magnetic field at the adjacent corners of the two magnets 2 can be changed, the density of the reverse magnetic field at the adjacent corners of the two magnets 2 can be reduced, and the magnetic field concentration at the adjacent corners of the two magnets 2 can be avoided, thereby improving the anti-demagnetization ability at the adjacent corners of the two magnets 2.
[0028] In some preferred embodiments, the slot structure satisfies: 0.2≤h3 / H≤0.8; where h3 is the height of the third protrusion 15 and H is the width of the magnet slot 11. When the height of the third protrusion 15 is too low, its influence on the distribution of the reverse magnetic field at the corner of the magnet 2 is small. In this case, it may not be possible to optimize the magnetic field distribution density at the corner of the magnet 2, thus failing to improve the concentration of the reverse magnetic field at the corner of the magnet 2, making the corner of the magnet 2 prone to demagnetization. When the height of the third protrusion 15 is too large, it is easy to increase magnetic leakage, which has an adverse effect on motor efficiency. In this embodiment, by designing the height of the third protrusion 15 to be 0.2≤h3 / H≤0.8, the occurrence of the above two situations can be effectively avoided, improving the anti-demagnetization ability of the corner of the magnet 2 while ensuring motor efficiency.
[0029] In this embodiment, the third protrusion 15 is disposed on the side wall of the magnet slot 11 away from the center of the rotor lamination. The third protrusion 15 is oriented towards the center of the rotor lamination, meaning that the third protrusion 15 extends from the outside towards the center of the rotor lamination, and its width gradually increases along the protrusion direction. This shape design allows for better fit between the third protrusion 15 and the adjacent corners of the two magnets 2, which helps to improve the optimization effect of the reverse magnetic field at that location, better disperses the reverse magnetic field, avoids magnetic field concentration, and improves the demagnetization resistance of the adjacent corners of the two magnets 2.
[0030] like Figure 5As shown, in another optional embodiment, the magnetic steel groove 11 includes a first groove segment and a second groove segment, which are arranged at an angle to form a V-shaped structure. The groove structure also includes a partition 16 located between the first groove segment and the second groove segment, separating the first groove segment and the second groove segment from each other. By adopting the design of the partition 16, the direction of the magnetic field lines can also be guided, the magnetic field distribution can be improved, the magnetic field concentration can be avoided, and the demagnetization resistance of the adjacent corners of the two magnets 2 can be improved.
[0031] As an optional embodiment, the rotor lamination structure satisfies: 8mm ≤ H*P ≤ 10mm; where H is the width of the magnet slot 11, and P is the number of pole pairs of the motor using the rotor lamination. Because the above structural design improves the demagnetization resistance of the magnet 2, the width of the magnet 2 can be made smaller while still meeting the demagnetization resistance requirement. That is, the above structure allows for a smaller magnet slot width H, i.e., 8mm ≤ H*P ≤ 10mm. In related technologies, the motor H*P is larger than this range, resulting in higher motor costs.
[0032] Specifically, there are multiple slot structures, which are arranged sequentially at intervals along the circumference of the rotor laminations.
[0033] In addition, embodiments of this utility model also provide a rotor structure, which includes: a rotor core, the rotor core including a plurality of rotor laminations 1 stacked sequentially, wherein the rotor laminations 1 are the aforementioned rotor laminations, and the slot structures of the plurality of rotor laminations 1 are correspondingly arranged; magnets 2, the magnets 2 passing through the magnet slots 11 of the plurality of rotor laminations 1, wherein the end of the magnets 2 contacts at least a portion of the first protrusion 13 and the second protrusion 14 of the rotor laminations 1.
[0034] Finally, an embodiment of the present invention also provides an electric motor, which includes a rotor structure 10 and a stator structure 20. The rotor structure 10 is rotatably mounted within the stator structure 20, wherein the rotor structure 10 is the rotor structure described above.
[0035] Figure 7 This diagram illustrates a comparison of the demagnetizing area ratio and demagnetizing current between a motor (the original structure on the left) in related technologies and a motor with rotor laminations using this invention (the new structure on the right). Figure 7 As can be seen from the above, compared with motors in related technologies, the motor using the rotor laminations of this utility model has a significantly increased demagnetizing current (i.e., demagnetizing current) of the permanent magnet (i.e., magnet steel), making it less prone to demagnetization. Furthermore, the proportion of the permanent magnet's demagnetization area is significantly reduced, meaning that under long-term use, the area where the permanent magnet may demagnetize is smaller, resulting in less performance degradation in the motor.
[0036] Figure 8This diagram illustrates a comparison of the demagnetizing current and motor cost between motors in related technologies and motors using rotor laminations according to embodiments of this utility model. Figure 8 As can be seen from the above, compared with motors in related technologies, the permanent magnet of the motor using the rotor lamination of this utility model has a larger resistance to demagnetization current. Therefore, while meeting the resistance to demagnetization requirements, a thinner permanent magnet can be used, thus effectively reducing the cost of the permanent magnet.
[0037] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: The rotor lamination of this utility model embodiment is provided with a slot structure, the slot structure including: a magnet slot 11, the magnet slot 11 is disposed through the rotor lamination; a magnetic isolation slot 12, the magnetic isolation slot 12 is disposed through the rotor lamination and is disposed at the end of the magnet slot 11, the magnetic isolation slot 12 is connected to the magnet slot 11; a first protrusion 13 and a second protrusion 14, the first protrusion 13 and the second protrusion 14 are disposed between the magnet slot 11 and the magnetic isolation slot 12, along the width direction of the magnet slot 11, the first protrusion 13 and the second protrusion 14 are correspondingly disposed on two opposite inner sidewalls of the magnet slot 11, the first protrusion 13 and the second protrusion 14 are protruding towards each other. The rotor lamination with the above-described structure has a first protrusion 13 and a second protrusion 14 positioned between the magnet slot 11 and the magnetic isolation slot 12. These protrusions face each other along the width of the magnet slot 11, meaning they extend towards each other. When the magnet 2 is installed in the magnet slot 11, its two corners will contact the first protrusion 13 and the second protrusion 14. When the motor using this rotor lamination operates, the presence of the first protrusion 13 and the second protrusion 14 alters the distribution of the reverse magnetic field at the corners of the magnet 2, making the reverse magnetic field more dispersed and reducing its density. This reduces the disruption to the magnetic domain arrangement at the corners and lowers the risk of demagnetization in the corner region. By optimizing the design for the corners of the magnet 2, which are prone to demagnetization, the corners of the magnet 2 are less susceptible to demagnetization, resulting in better overall demagnetization resistance for the magnet 2. This solves the technical problem of easy demagnetization of magnets in permanent magnet synchronous motors in related technologies.
[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A rotor lamination, characterized in that, The rotor lamination has a slot structure, the slot structure including: A magnet slot (11) is provided, which penetrates the rotor lamination; A magnetic isolation groove (12) is provided through the rotor lamination and is located at the end of the magnetic steel groove (11). The magnetic isolation groove (12) is connected to the magnetic steel groove (11). The first protrusion (13) and the second protrusion (14) are disposed between the magnet groove (11) and the magnetic isolation groove (12). Along the width direction of the magnet groove (11), the first protrusion (13) and the second protrusion (14) are correspondingly disposed on two opposite inner sidewalls of the magnet groove (11). The first protrusion (13) and the second protrusion (14) are arranged to protrude towards each other.
2. The rotor lamination according to claim 1, characterized in that, The groove structure satisfies: 0.2≤(h1+h2) / H≤0.7; Wherein, h1 is the protrusion height of the first protrusion (13) along the width direction of the magnet groove (11), h2 is the protrusion height of the second protrusion (14) along the width direction of the magnet groove (11), and H is the width of the magnet groove (11).
3. The rotor lamination according to claim 1, characterized in that, The magnet slot (11) has a V-shaped structure, and the opening direction of the V-shaped structure is away from the center of the rotor lamination, wherein: There are two magnetic isolation grooves (12), and the two magnetic isolation grooves (12) are respectively arranged at both ends of the magnetic steel groove (11). There are two first protrusions (13) and two second protrusions (14). For any magnetic isolation groove (12), there is a first protrusion (13) and a second protrusion (14) between it and the magnetic steel groove (11).
4. The rotor lamination according to claim 3, characterized in that, The magnetic steel groove (11) includes a first groove segment and a second groove segment, the first groove segment and the second groove segment being arranged at an included angle to form the V-shaped structure, the groove structure further including: The third protrusion (15) is disposed on the inner sidewall of the magnet groove (11) and protrudes into the magnet groove (11). The third protrusion (15) is located between the first groove segment and the second groove segment.
5. The rotor lamination according to claim 4, characterized in that, The groove structure satisfies: 0.2≤h³ / H≤0.8; Where h3 is the protrusion height of the third protrusion (15) and H is the width of the magnetic groove (11).
6. The rotor lamination according to claim 4, characterized in that, The third protrusion (15) is disposed on the side wall of the magnet groove (11) away from the center of the rotor lamination. The third protrusion (15) is convex toward the center of the rotor lamination. Along the convex direction of the third protrusion (15), the width of the third protrusion (15) gradually increases.
7. The rotor lamination according to claim 3, characterized in that, The magnetic steel groove (11) includes a first groove segment and a second groove segment, the first groove segment and the second groove segment being arranged at an included angle to form the V-shaped structure, the groove structure further including: A partition (16) is located between the first slot segment and the second slot segment, and the partition (16) separates the first slot segment and the second slot segment from each other.
8. The rotor lamination according to any one of claims 1 to 7, characterized in that, The rotor lamination structure satisfies: 8mm ≤ H*P ≤ 10mm; where H is the width of the magnet slot (11), and P is the number of pole pairs of the motor using the rotor lamination; and / or, The slot structure is multiple, and the multiple slot structures are arranged sequentially at intervals along the circumference of the rotor lamination.
9. A rotor structure, characterized in that, The rotor structure includes: The rotor core comprises a plurality of rotor laminations (1) stacked sequentially, wherein the rotor laminations (1) are rotor laminations as described in any one of claims 1 to 8, and the slot structures of the plurality of rotor laminations (1) are arranged correspondingly. A magnet (2) is inserted into a magnet slot (11) of a plurality of rotor laminations (1), wherein the end of the magnet (2) contacts at least a portion of a first protrusion (13) and a second protrusion (14) of the rotor laminations (1).
10. An electric motor, characterized in that, The motor includes a rotor structure (10) and a stator structure (20), wherein the rotor structure (10) is rotatably mounted within the stator structure (20), and the rotor structure (10) is the rotor structure as described in claim 9.