Rotor punching sheet, rotor, motor, electric assembly and vehicle

Abstract

The utility model discloses a rotor punching sheet, a rotor, a motor, an electric assembly and a vehicle, the rotor punching sheet is provided with a plurality of magnetic steel groove groups, the plurality of magnetic steel groove groups are arranged at intervals in the circumferential direction of the rotor punching sheet, each magnetic steel groove group comprises a first magnetic steel groove, the first magnetic steel groove comprises a first sub-groove and a third sub-groove, and the first sub-groove and the third sub-groove are arranged at intervals. The pole arc angle of the first magnetic steel groove is alpha 1, the field angle between the first sub-groove and the third sub-groove is alpha 2, alpha 2 = k1 * alpha 1, and k1 is larger than or equal to 2.1 and smaller than or equal to 2.5; and / or a second magnetic steel groove, the second magnetic steel groove comprises a fourth sub-groove and a sixth sub-groove which are arranged at an interval, the pole arc angle of the second magnetic steel groove is alpha3, the field angle between the fourth sub-groove and the sixth sub-groove is alpha4, alpha4 = k2 * alpha3, and k2 is larger than or equal to 5.5 and smaller than or equal to 5.9. According to the rotor punching sheet of the utility model, the limit rotation speed and the power density of a rotor can be improved, and the NVH performance of a motor can be improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a rotor lamination, a rotor, a motor, an electric assembly, and a vehicle. Background Technology

[0002] In some related technologies, when designing the rotor, a thicker magnetic bridge is required to meet the requirements of the rotor to reach extremely high speeds. However, this can easily lead to severe magnetic leakage of the magnets, making it difficult to achieve the requirements of high power density. In other related technologies, while the requirements of high power density of the motor can be met, it can lead to problems such as noise and vibration in the motor, affecting the normal use of the motor. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a rotor lamination that can improve the rotor's limiting speed and power density, and also enhance the NVH performance of the motor.

[0004] Another objective of this invention is to provide a rotor having the aforementioned rotor laminations.

[0005] Another objective of this invention is to provide an electric motor having the aforementioned rotor.

[0006] Another objective of this invention is to provide an electric assembly having the aforementioned motor.

[0007] Another objective of this invention is to provide a vehicle having the aforementioned electric powertrain or motor.

[0008] According to an embodiment of the present invention, a rotor lamination is provided with a plurality of magnet slot groups, which are spaced apart in the circumferential direction of the rotor lamination. Each magnet slot group includes: a first magnet slot, which includes a first sub-slot and a third sub-slot spaced apart, the pole arc angle of the first magnet slot being α1, and the angle between the first sub-slot and the third sub-slot being α2, α2=k1×α1, where k1 satisfies: 2.1≤k1≤2.5; and / or a second magnet slot, which includes a fourth sub-slot and a sixth sub-slot spaced apart, the pole arc angle of the second magnet slot being α3, and the angle between the fourth sub-slot and the sixth sub-slot being α4, α4=k2×α3, where k2 satisfies: 5.5≤k2≤5.9.

[0009] According to the rotor lamination of this utility model embodiment, the magnetic slot group includes a first magnetic slot and / or a second magnetic slot. The pole arc angle of the first magnetic slot is α1, and the angle between the first sub-slot and the third sub-slot is α2, where α2 = k1α1, and k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The pole arc angle of the second magnetic slot is α3, and the angle between the fourth sub-slot and the sixth sub-slot is α4, where α4 = k2 × α3, and k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This increases the area enclosed by the first magnetic slot and / or the second magnetic slot, resulting in more magnets and greater magnetic reluctance torque. This improves the rotor's limiting speed and power density, and reduces the high-order harmonic content in the motor's main magnetic field, thereby reducing motor noise and vibration and improving the motor's NVH performance.

[0010] In addition, the rotor laminations according to the above embodiments of this utility model may also have the following additional technical features:

[0011] According to some embodiments of the present invention, the rotor laminations are α1=(k3×180°) / p, where k3 satisfies: 0.55≤k3≤0.65, and p is the number of motor poles.

[0012] According to some embodiments of the present invention, the first sub-slot and the third sub-slot extend obliquely away from each other in the radially outward direction along the rotor lamination, and the angle between the straight segments of the first sub-slot and the third sub-slot that are close to each other is formed as the opening angle of the first magnet slot.

[0013] According to some embodiments of the present invention, the first magnetic steel groove further includes a second sub-groove, which is located between the radial inner ends of the first sub-groove and the third sub-groove.

[0014] According to some embodiments of the present invention, there are two second sub-slots, which are spaced apart between the first sub-slot and the third sub-slot, and a reinforcing rib is provided between the two second sub-slots.

[0015] According to some embodiments of the present invention, the fourth sub-slot and the sixth sub-slot extend obliquely away from each other in the radially outward direction along the rotor lamination, and the angle between the straight segments of the fourth sub-slot and the sixth sub-slot that are close to each other forms the opening angle of the second magnet slot.

[0016] According to some embodiments of the present invention, the second magnetic steel groove further includes a fifth sub-groove, which is located between the radial inner ends of the fourth and sixth sub-grooves.

[0017] According to some embodiments of this utility model, α3=(k4×180°) / p, where k4 satisfies: 0.3≤k4≤0.35, and p is the number of poles of the motor.

[0018] According to some embodiments of the present invention, each of the magnet slot groups further includes: a third magnet slot, wherein the third magnet slot is provided on at least one side of the first magnet slot along the radial direction of the rotor lamination, either the radial inner side or the radial outer side.

[0019] According to some embodiments of the present invention, when the magnet slot group includes a first magnet slot and a second magnet slot, the second magnet slot is located radially outside the first magnet slot along the radial direction of the rotor lamination.

[0020] The rotor according to an embodiment of the present invention includes rotor laminations as described in the embodiment of the present invention.

[0021] According to the embodiment of this utility model, the rotor, through a magnetic slot group including a first magnetic slot and / or a second magnetic slot, has a pole arc angle of α1 for the first magnetic slot, an angle between the first sub-slot and the third sub-slot of α2, α2 = k1α1, where k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The pole arc angle of the second magnetic slot is α3, and the angle between the fourth sub-slot and the sixth sub-slot of α4, α4 = k2 × α3, where k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This increases the area enclosed by the first magnetic slot and / or the second magnetic slot, resulting in a greater amount of magnets, a larger reluctance torque, and improved rotor speed and power density. Furthermore, it reduces the high-order harmonic content in the main magnetic field of the motor, thereby reducing motor noise and vibration and improving the NVH performance of the motor.

[0022] The motor according to an embodiment of the present invention includes the rotor described in the embodiment of the present invention.

[0023] According to the embodiment of this utility model, the motor uses a magnet slot assembly including a first magnet slot and / or a second magnet slot. The pole arc angle of the first magnet slot is α1, and the angle between the first sub-slot and the third sub-slot is α2, where α2 = k1α1 and k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The pole arc angle of the second magnet slot is α3, and the angle between the fourth sub-slot and the sixth sub-slot is α4, where α4 = k2 × α3 and k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This increases the area enclosed by the first magnet slot and / or the second magnet slot, resulting in a larger amount of magnets, greater magnetic reluctance torque, improved rotor speed limit and power density, and lower high-order harmonic content in the motor's main magnetic field, thus reducing motor noise and vibration and improving NVH performance.

[0024] The electric powertrain according to an embodiment of the present invention includes the motor described in the embodiment of the present invention.

[0025] According to the electric assembly of this utility model embodiment, the magnetic steel slot group includes a first magnetic steel slot and / or a second magnetic steel slot. The pole arc angle of the first magnetic steel slot is α1, and the angle between the first sub-slot and the third sub-slot is α2, where α2 = k1α1 and k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The pole arc angle of the second magnetic steel slot is α3, and the angle between the fourth sub-slot and the sixth sub-slot is α4, where α4 = k2 × α3 and k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This increases the area enclosed by the first magnetic steel slot and / or the second magnetic steel slot, resulting in a larger amount of magnets, greater magnetic reluctance torque, improved rotor limit speed and power density, and lower high-order harmonic content in the motor's main magnetic field, thus reducing motor noise and vibration and improving the motor's NVH performance.

[0026] The vehicle according to an embodiment of the present invention includes the electric powertrain described in the embodiment of the present invention, or includes the motor described in the embodiment of the present invention.

[0027] According to the vehicle of this utility model embodiment, the magnetic steel slot assembly includes a first magnetic steel slot and / or a second magnetic steel slot. The pole arc angle of the first magnetic steel slot is α1, and the angle between the first sub-slot and the third sub-slot is α2, where α2 = k1α1 and k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The pole arc angle of the second magnetic steel slot is α3, and the angle between the fourth sub-slot and the sixth sub-slot is α4, where α4 = k2 × α3 and k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This increases the area enclosed by the first magnetic steel slot and / or the second magnetic steel slot, resulting in a greater amount of magnets and a larger magnetic reluctance torque. This improves the rotor's limiting speed and power density, and reduces the high-order harmonic content in the motor's main magnetic field, thereby reducing motor noise and vibration and improving the motor's NVH performance.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the rotor structure according to an embodiment of the present utility model;

[0031] Figure 2 This is a partial structural schematic diagram of the rotor according to an embodiment of the present utility model (where angle markings are provided);

[0032] Figure 3 This is a partial structural schematic diagram of the rotor according to an embodiment of the present utility model (where length markings are provided);

[0033] Figure 4 According to embodiment 24 of this utility model p Relationship between torque pulsation rate and k1 and k2.

[0034] Figure label:

[0035] 100, rotor laminations; 200, rotor; 300, magnets;

[0036] 10. Magnet slot assembly; 11. First magnet slot; 12. Second magnet slot; 13. Weight reduction hole;

[0037] 21. First sub-slot; 22. Second sub-slot; 23. Third sub-slot; 24. Fourth sub-slot; 25. Fifth sub-slot; 26. Sixth sub-slot; 231. Reinforcing rib;

[0038] 30. Auxiliary slot. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "first feature above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0042] The rotor lamination 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0043] Reference Figures 1-3 As shown, according to an embodiment of the present invention, a rotor lamination 100 is provided with a plurality of magnet slot groups 10. The plurality of magnet slot groups 10 are spaced apart in the circumferential direction of the rotor lamination 100. The plurality of magnet slot groups 10 can realize the assembly of magnets 300 to meet the required assembly requirements. Each magnet slot group 10 may include: a first magnet slot 11.

[0044] Specifically, the first magnetic steel groove 11 includes a first sub-groove 21 and a third sub-groove 23 spaced apart. The polar arc angle of the first magnetic steel groove 11 is α1, and the angle between the first sub-groove 21 and the third sub-groove 23 is α2, where α2 = k1 × α1, and k1 satisfies: 2.1 ≤ k1 ≤ 2.5, that is, the angle of the first magnetic steel groove 11 can be taken within the range of 2.1α2-2.5α2. Since the angle of the first magnetic steel groove 11 affects the harmonic content of the air gap magnetic field, the required requirements can be met by limiting the angle of the first magnetic steel groove 11.

[0045] Therefore, by limiting the angle of the first magnet slot 11 to the aforementioned range, the area enclosed by the first magnet slot 11 can be increased, resulting in a greater quantity of magnets 300 and a larger magnetic reluctance torque. This improves the limiting speed and power density of the rotor 200 and avoids problems such as motor noise and vibration caused by a large enclosed area of ​​the first magnet slot 11. It also reduces the high-order harmonic content in the motor's main magnetic field, thereby lowering motor noise and vibration and improving the motor's noise, vibration, and harshness (NVH) performance. For example, in some specific embodiments, k1 can be 2.1, 2.2, 2.3, 2.4, 2.5, etc.

[0046] Or, such as Figures 1-3 As shown, each magnet slot group 10 includes a second magnet slot 12, which includes a fourth sub-slot 24 and a sixth sub-slot 26 spaced apart. The polar arc angle of the second magnet slot 12 is α3, and the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, where α4 = k2 × α3, and k2 satisfies: 5.5 ≤ k2 ≤ 5.9, that is, the angle of the second magnet slot 12 can be taken within the range of 5.5α3-5.9α3. Since the angle of the second magnet slot 12 affects the harmonic content of the air gap magnetic field, the required requirements can be met by limiting the angle of the second magnet slot 12.

[0047] Therefore, by limiting the angle of the second magnet slot 12 to the aforementioned range, the area enclosed by the second magnet slot 12 can be increased, resulting in a larger quantity of magnets 300 and a greater magnetic reluctance torque. This further improves the limiting speed and power density of the rotor 200. Furthermore, it avoids the problems of motor noise and vibration caused by a large enclosed area of ​​the second magnet slot 12, resulting in a lower content of high-order harmonics in the motor's main magnetic field, thereby reducing motor noise and vibration and improving the motor's NVH performance. For example, in some specific embodiments, k2 can be 5.5, 5.6, 5.7, 5.8, 5.9, etc.

[0048] Or, for example Figures 1-3 As shown, each magnet slot group 10 includes a first magnet slot 11 and a second magnet slot 12. The first magnet slot 11 includes a first sub-slot 21 and a third sub-slot 23 spaced apart. The polar arc angle of the first magnet slot 11 is α1, and the angle between the first sub-slot 21 and the third sub-slot 23 is α2, where α2 = k1 × α1, and k1 satisfies: 2.1 ≤ k1 ≤ 2.5. The second magnet slot 12 includes a fourth sub-slot 24 and a sixth sub-slot 26 spaced apart. The polar arc angle of the second magnet slot 12 is α3, and the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, where α4 = k2 × α3, and k2 satisfies: 5.5 ≤ k2 ≤ 5.9. Since the angles of the first magnet slot 11 and the second magnet slot 12 affect the harmonic content of the air gap magnetic field, limiting the angles of the first magnet slot 11 and the second magnet slot 12 can meet the required requirements.

[0049] Therefore, by setting the first magnet slot 11 and the second magnet slot 12, the amount of magnet 300 can be increased, resulting in a larger reluctance torque, which is beneficial to improving power density. Furthermore, by limiting the opening angle of the first magnet slot 11 and the opening angle of the second magnet slot 12, the amount of magnet 300 can be increased, resulting in a larger reluctance torque. This can further improve the limiting speed and power density of the rotor 200, and avoid problems such as motor noise and vibration. It also results in a smaller high-order harmonic content in the main magnetic field of the motor, thereby reducing motor noise and vibration and improving the NVH performance of the motor.

[0050] It should be noted that the "polar arc angle of the first magnet slot 11" can be understood as the angle between the two ends of the first magnet slot 11 that are close to each other along the radial outer side of the rotor lamination 100, and the "polar arc angle of the second magnet slot 12" can be understood as the angle between the two ends of the second magnet slot 12 that are close to each other along the radial outer side of the rotor lamination 100.

[0051] In embodiments of this utility model, the number of magnet slot groups 10 can be flexibly set according to actual conditions. For example, the magnet slot groups 10 can be arranged as follows: Figure 1The number shown is six, but it can also be two, three, four, five, seven or more, all of which are within the protection scope of this utility model.

[0052] In related technologies, V-shaped magnets are added to both sides of the rotor laminations to create a magnetic focusing effect and increase output torque. However, when the outer diameter of the rotor laminations is large, the centrifugal force experienced by the rotor at high speed is large. Since the number of reinforcing ribs that distribute stress in the rotor laminations is relatively small, if the rotor is to reach extremely high speeds, a thicker magnetic isolation bridge is required to meet the requirements. However, this can easily lead to severe magnetic leakage of the magnets, making it difficult to achieve the requirements of high power density.

[0053] In this utility model, the magnet slot group 10 includes a first magnet slot 11 and a second magnet slot 12, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, which can increase the area enclosed by the first magnet slot 11 and the second magnet slot 12, which is beneficial to improving the limiting speed and power density of the rotor 200, and can reduce the noise and vibration of the motor, and improve the NVH performance of the motor.

[0054] According to the embodiment of this utility model, the rotor lamination 100, through the magnet slot group 10 including a first magnet slot 11 and / or a second magnet slot 12, the pole arc angle of the first magnet slot 11 is α1, the angle between the first sub-slot 21 and the third sub-slot 23 is α2, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, the pole arc angle of the second magnet slot 12 is α3, the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, can increase the area enclosed by the first magnet slot 11 and / or the second magnet slot 12, so that more magnets 300 are used, the magnetic reluctance torque is greater, which can improve the limiting speed and power density of the rotor 200, and make the high-order harmonic content in the main magnetic field of the motor smaller, which can reduce the noise and vibration of the motor and is beneficial to improving the NVH performance of the motor.

[0055] In some embodiments of this utility model, α1 = (k3 × 180°) / p, where k3 satisfies: 0.55 ≤ k3 ≤ 0.65, and p is the number of motor poles. Therefore, by limiting the pole arc angle α1 of the first magnet slot 11, the 24° angle can be effectively reduced. p The electromagnetic force can improve the NVH performance of the motor. For example, in some specific embodiments, k3 can be 0.55, 0.59, 0.60, 0.63, 0.65, etc.

[0056] In some embodiments, when α1 = (0.59 × 180°) / p and remains constant, α2 = k1 × α1, where k1 satisfies 2.1 ≤ k1 ≤ 2.5. This results in a lower content of higher harmonics in the main magnetic field of the motor, effectively reducing the harmonic content by 24%. p The electromagnetic force can reduce the noise and vibration of the motor, thereby further ensuring the NVH performance of the motor.

[0057] In embodiments of this invention, the specific selection of the number of motor poles p can be set according to actual conditions. For example, the number of motor poles p can be 4, 6, 8, etc., depending on the specific motor selected.

[0058] For example, such as Figure 3 As shown, when the number of poles p of the motor is 6, the central axis of the rotor lamination 100 is defined as the d-axis, and the axis that is 30° away from the d-axis is defined as the q-axis. In the concept of electrical angle, since the electrical angle is several times the mechanical angle of the pole pair, the motor has 6 rotor 200 poles and 3 pole pairs, so the electrical angle is 3 times the mechanical angle. The d-axis and q-axis are 90° apart.

[0059] In some embodiments, such as Figure 3 As shown, the rotor laminations 100 are symmetrically distributed about the d-axis, which ensures that the magnetic flux is evenly distributed inside the motor, ensuring the motor's operational stability and improving the motor's working efficiency.

[0060] In the embodiments of this utility model, the specific structure of the first magnetic steel groove 11 can be set according to the actual situation.

[0061] For example, in some embodiments, such as Figure 2 and Figure 3 As shown, along the radial outward direction of the rotor lamination 100, the first sub-slot 21 and the third sub-slot 23 extend inclined away from each other. The angle between the straight segments of the first sub-slot 21 and the third sub-slot 23 that are close to each other forms the angle of the first magnet slot 11, so that the first magnet slot 11 can be formed into a "V" shape, which can realize different design requirements of the first magnet slot 11, thereby realizing different design requirements of the rotor lamination 100, and can meet different installation requirements of the magnet 300 in the first magnet slot 11. Moreover, the structure of the first magnet slot 11 is simple and easy to process and manufacture.

[0062] For example, in some embodiments, such as Figure 2 and Figure 3As shown, the first magnet slot 11 also includes a second sub-slot 22, which is located between the radial inner ends of the first sub-slot 21 and the third sub-slot 23, so that the first magnet slot 11 can be formed into a "U" shape, which can realize different design requirements of the first magnet slot 11, thereby realizing different design requirements of the rotor lamination 100, and can meet different installation requirements of the magnet 300 in the first magnet slot 11. Moreover, the structure of the first magnet slot 11 is simple and easy to process and manufacture.

[0063] In some embodiments, such as Figure 2 and Figure 3 As shown, the extension direction of the second sub-slot 22 is perpendicular to the radial direction of the rotor lamination 100, which makes the structure of the second sub-slot 22 simple and easy to process and manufacture.

[0064] In some embodiments, the distance between the second sub-slot 22 and the first sub-slot 21 and the third sub-slot 23 varies with the size of the opening angle of the first magnet slot 11. For example, the distance between the second sub-slot 22 and the first sub-slot 21 and the third sub-slot 23 increases with the increase of the opening angle of the first magnet slot 11, which can ensure the structural strength of the first magnet slot 11 and ensure that the motor reaches the same limit speed.

[0065] In related technologies, in the rotor of an electric motor, for example when the motor is running at ultra-high speed, the rotor is subjected to centrifugal force during rotation, and the magnetic bridge of the rotor will be subjected to a large stress concentration. When this stress exceeds the allowable stress strength of the rotor lamination material and is subjected to this stress for a long time, the rotor lamination is prone to fracture failure.

[0066] Therefore, according to some embodiments of the present invention, such as Figures 1-3 As shown, there are two second sub-slots 22, which are spaced apart between the first sub-slot 21 and the third sub-slot 23. A reinforcing rib 231 is provided between the two second sub-slots 22. The reinforcing rib 231 can improve the structural strength between the two second sub-slots 22. When the motor is running at high speed, the stress of the rotor lamination 100 is small, which can be used for high-speed conditions. It is also beneficial to improve the magnetic reluctance torque, reduce leakage flux, and ensure the NVH performance of the motor.

[0067] In some embodiments, depending on the length of the two second sub-slots 22, when the length requirement of the two second sub-slots 22 is met, a reinforcing rib 231 can be provided between the two second sub-slots 22, or the number of reinforcing ribs 231 can be increased accordingly to improve the structural strength between the two second sub-slots 22; or, depending on the length of the second sub-slots 22, when the length requirement of the two second sub-slots 22 is not met, that is, when the requirement to provide reinforcing ribs 231 is not met within the two second sub-slots 22, no reinforcing rib 231 is provided between the two second sub-slots 22.

[0068] According to some embodiments of this utility model, α3 = (k4 × 180°) / p, where k4 satisfies: 0.3 ≤ k4 ≤ 0.35, and p is the number of motor poles. Therefore, by limiting the pole arc angle α3 of the second magnet slot 12, the 24... p The electromagnetic force can improve the NVH performance of the motor. For example, in some specific embodiments, k4 can be 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, etc.

[0069] In the embodiments of this utility model, the specific structure of the second magnetic groove 12 can be set according to the actual situation.

[0070] For example, in some embodiments, such as Figure 2 and Figure 3 As shown, along the radial outward direction of the rotor lamination 100, the fourth sub-slot 24 and the sixth sub-slot 26 extend inclined away from each other. The angle between the straight segments of the fourth sub-slot 24 and the sixth sub-slot 26 that are close to each other forms the angle of the second magnet slot 12, so that the second magnet slot 12 can be formed into a "V" shape, which can realize different design requirements of the second magnet slot 12, thereby realizing different design requirements of the rotor lamination 100, and can meet different installation requirements of the magnet 300 in the second magnet slot 12. Moreover, the structure of the second magnet slot 12 is simple and easy to process and manufacture.

[0071] For example, in some embodiments, such as Figure 2 and Figure 3 As shown, the second magnet slot 12 also includes a fifth sub-slot 25, which is located between the radial inner ends of the fourth sub-slot 24 and the sixth sub-slot 26, so that the second magnet slot 12 can be formed into a "U" shape, which can realize different design requirements of the second magnet slot 12, thereby realizing different design requirements of the rotor lamination 100, and can meet different installation requirements of the magnet 300 in the second magnet slot 12. Moreover, the structure of the second magnet slot 12 is simple and easy to process and manufacture.

[0072] In some embodiments, there are two fifth sub-slots 25, which are spaced apart between the fourth sub-slot 24 and the sixth sub-slot 26. A reinforcing rib 231 is provided between the two fifth sub-slots 25. The reinforcing rib 231 can improve the structural strength between the two fifth sub-slots 25. When the motor is running at high speed, the stress on the rotor lamination 100 is small, which is suitable for high-speed conditions. It is also beneficial to improve the magnetic reluctance torque, reduce leakage flux, and ensure the NVH performance of the motor.

[0073] In some embodiments, depending on the length of the two fifth sub-slots 25, when the length requirement of the two fifth sub-slots 25 is met, a reinforcing rib 231 can be provided between the two fifth sub-slots 25, or the number of reinforcing ribs 231 can be increased accordingly to improve the structural strength between the two fifth sub-slots 25; or, depending on the length of the fifth sub-slots 25, when the length requirement of the two fifth sub-slots 25 is not met, that is, when the requirement to provide reinforcing ribs 231 is not met within the two fifth sub-slots 25, no reinforcing ribs 231 are provided between the two fifth sub-slots 25.

[0074] In some embodiments, such as Figure 2 and Figure 3 As shown, the extension direction of the fifth sub-slot 25 is perpendicular to the radial direction of the rotor lamination 100, which makes the structure of the fifth sub-slot 25 simple and easy to process and manufacture.

[0075] In some embodiments, the distance between the fifth sub-slot 25 and the fourth sub-slot 24 and the sixth sub-slot 26 varies with the size of the opening angle of the second magnet slot 12. For example, the distance between the fifth sub-slot 25 and the fourth sub-slot 24 and the sixth sub-slot 26 increases with the increase of the opening angle of the second magnet slot 12, which can ensure the structural strength of the second magnet slot 12 and ensure that the motor reaches the same limit speed.

[0076] In some embodiments of this utility model, each magnet slot group 10 further includes a third magnet slot. The first magnet slot 11 is provided with a third magnet slot on at least one side of the radial inner side and the radial outer side along the radial direction of the rotor lamination 100. That is, the first magnet slot 11 is provided with a third magnet slot on the radial inner side along the radial direction of the rotor lamination 100, or the first magnet slot 11 is provided with a third magnet slot on the radial outer side along the radial direction of the rotor lamination 100, or the first magnet slot 11 is provided with a third magnet slot on both the radial inner side and the radial outer side along the radial direction of the rotor lamination 100. This can increase the amount of magnets 300, which is beneficial to improving the limiting speed and power density of the rotor 200, and can be set according to the actual situation to meet different design requirements.

[0077] In some embodiments of the magnet slot group 10, which includes a first magnet slot 11 and a second magnet slot 12, a third magnet slot may be located between the first magnet slot 11 and the second magnet slot 12, or the third magnet slot may be located on the radially outer side of the second magnet slot 12 along the radial direction of the rotor lamination 100. This can be configured according to actual conditions to meet different design requirements.

[0078] In some embodiments of this utility model, such as Figures 1-3As shown, when the magnet slot group 10 includes a first magnet slot 11 and a second magnet slot 12, the second magnet slot 12 is located radially outside the first magnet slot 11 along the radial direction of the rotor lamination 100, and α2=k1×α1, k1 satisfies: 2.1≤k1≤2.5, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9. This allows the magnet 300 to occupy less space in the radial direction of the rotor lamination 100, which can increase the length of the yoke of the rotor 200, thereby improving the strength of the rotor 200 and meeting the requirements of high speed of the motor.

[0079] In some embodiments, such as Figure 2 and Figure 3 As shown, along the radial outward direction of the rotor lamination 100, the first sub-slot 21 and the third sub-slot 23 extend inclined away from each other, and the second sub-slot 22 is located between the radial inner ends of the first sub-slot 21 and the third sub-slot 23. That is, the first magnet slot 11 is formed as a "U". Along the radial outward direction of the rotor lamination 100, the fourth sub-slot 24 and the sixth sub-slot 26 extend inclined away from each other, and the fifth sub-slot 25 is located between the radial inner ends of the fourth sub-slot 24 and the sixth sub-slot 26. That is, the second magnet slot 12 is formed as a "U". This can further reduce the space occupied by the magnet 300 in the radial direction of the rotor lamination 100, increase the length of the yoke of the rotor 200, thereby improving the strength of the rotor 200 and meeting the requirements of high speed of the motor.

[0080] In some embodiments, when α1 = (0.59 × 180°) / p and remains constant, α2 = k1 × α1, where k1 satisfies: 2.1 ≤ k1 ≤ 2.5; and when α3 = (0.33 × 180°) / p and remains constant, α4 = k2 × α3, where k2 satisfies: 5.5 ≤ k2 ≤ 5.9. This ensures that the high-order harmonic content in the main magnetic field of the motor is low, effectively reducing 24 p The electromagnetic force can reduce motor noise and vibration, further ensuring the motor's NVH performance. For example, such as Figure 4 The 24 shown p The relationship between torque ripple rate and k1 and k2 shows that within this range, the content of higher harmonics in the main magnetic field of the motor is small, the noise is low, and the NVH performance of the motor can be ensured.

[0081] In some embodiments, such as Figure 3 As shown, the span of the first magnet slot 11 is W1, and the span between the first magnet slot 11 and the second magnet slot 12 is W2. When the opening angle of the first magnet slot 11 increases, W1 increases, which can make the area enclosed by the first magnet slot 11 larger, the amount of magnet 300 used is more, and the magnetic reluctance torque is greater, thereby improving the power density. At the same time, W2 increases, which can ensure the distance between the first magnet slot 11 and the second magnet slot 12, and ensure that the yoke ratio of the rotor 200 meets the strength requirements.

[0082] It should be noted that the "span of the first magnet slot 11" can be understood as the distance between the center point of the width of the first magnet slot 11 along the radial outer side of the rotor lamination 100 and the central axis of the rotor lamination 100. The "span between the first magnet slot 11 and the second magnet slot 12" can be understood as the distance between the center point of the width of the first magnet slot 11 along the radial outer side of the rotor lamination 100 and the center point of the length of the fourth sub-slot 24 or the sixth sub-slot 26 along the radial outer side of the rotor lamination 100.

[0083] In some embodiments, such as Figures 1-3 As shown, each magnet slot group 10 also includes a weight reduction hole 13. The weight reduction hole 13 is located on the radial outer side of the second magnet slot 12 along the radial direction of the rotor lamination 100. The weight reduction hole 13 can reduce the weight of the rotor lamination 100, which is convenient for achieving lightweighting and can reduce the use of materials, thus helping to reduce production costs.

[0084] In some embodiments, such as Figures 1-3 As shown, there are multiple weight reduction holes 13, which are spaced apart along the circumferential direction of the rotor lamination 100. The weight of the rotor lamination 100 can be further reduced by the multiple weight reduction holes 13, and the use of materials can be reduced, which is beneficial to reducing production costs.

[0085] In embodiments of this utility model, the number of weight-reducing holes 13 can be flexibly set according to actual conditions. For example, the weight-reducing holes 13 can be arranged as follows: Figure 2 The number shown is two, but it can also be three, four, five, six or more, all of which are within the protection scope of this utility model.

[0086] In some embodiments, such as Figure 2 and Figure 3 As shown, an auxiliary groove 30 is provided on the outer peripheral wall of the rotor lamination 100. The auxiliary groove 30 penetrates the rotor lamination 100 along the axial direction of the rotor lamination 100, which can optimize the back electromotive force waveform, reduce output torque fluctuation and reduce electromagnetic noise, thereby optimizing the current and voltage waveform of the motor and improving the NVH quality of the motor.

[0087] In some embodiments, such as Figure 2 and Figure 3 As shown, there can be multiple auxiliary slots 30 (two or more). The multiple auxiliary slots 30 are spaced apart along the circumferential direction of the rotor lamination 100, which can further improve the NVH quality of the motor.

[0088] It should be noted that the auxiliary slot 30 is known to those skilled in the art and will not be described in detail here.

[0089] The rotor 200 according to an embodiment of the present invention includes rotor laminations 100 according to an embodiment of the present invention. Since the rotor lamination 100 according to the present invention has the above-mentioned beneficial technical effects, the rotor 200 according to the present invention, through the magnet slot group 10 including the first magnet slot 11 and / or the second magnet slot 12, the pole arc angle of the first magnet slot 11 is α1, the angle between the first sub-slot 21 and the third sub-slot 23 is α2, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, the pole arc angle of the second magnet slot 12 is α3, the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, can increase the area enclosed by the first magnet slot 11 and / or the second magnet slot 12, so that more magnets 300 are used, the magnetic reluctance torque is greater, which can improve the limiting speed and power density of the rotor 200, and make the high-order harmonic content in the main magnetic field of the motor smaller, which can reduce the noise and vibration of the motor and is beneficial to improving the NVH performance of the motor.

[0090] The motor according to an embodiment of the present invention includes a rotor 200 according to an embodiment of the present invention. Since the rotor 200 according to the present invention has the above-mentioned beneficial technical effects, the motor according to the present invention, through the magnet slot group 10 including the first magnet slot 11 and / or the second magnet slot 12, the pole arc angle of the first magnet slot 11 is α1, the angle between the first sub-slot 21 and the third sub-slot 23 is α2, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, the pole arc angle of the second magnet slot 12 is α3, the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, can increase the area enclosed by the first magnet slot 11 and / or the second magnet slot 12, so that more magnets 300 are used, the magnetic reluctance torque is greater, which can improve the limiting speed and power density of the rotor 200, and make the high-order harmonic content in the main magnetic field of the motor smaller, which can reduce the noise and vibration of the motor and is beneficial to improving the NVH performance of the motor.

[0091] The electric powertrain according to an embodiment of the present invention includes a motor according to an embodiment of the present invention. Since the motor according to the present invention has the above-mentioned beneficial technical effects, the electric assembly according to the present invention, by having a magnet slot group 10 including a first magnet slot 11 and / or a second magnet slot 12, the pole arc angle of the first magnet slot 11 is α1, the angle between the first sub-slot 21 and the third sub-slot 23 is α2, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, the pole arc angle of the second magnet slot 12 is α3, the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, can increase the area enclosed by the first magnet slot 11 and / or the second magnet slot 12, resulting in a greater amount of magnets 300, a greater magnetic reluctance torque, and an improvement in the limiting speed and power density of the rotor 200. Furthermore, it reduces the high-order harmonic content in the main magnetic field of the motor, thereby reducing the noise and vibration of the motor and improving the NVH performance of the motor.

[0092] The vehicle according to an embodiment of the present invention includes an electric powertrain according to an embodiment of the present invention, or includes a motor according to an embodiment of the present invention. Since the electric assembly or motor according to the present invention has the above-mentioned beneficial technical effects, the vehicle according to the present invention, through the magnet slot group 10 including the first magnet slot 11 and / or the second magnet slot 12, the pole arc angle of the first magnet slot 11 is α1, the angle between the first sub-slot 21 and the third sub-slot 23 is α2, α2=k1α1, k1 satisfies: 2.1≤k1≤2.5, the pole arc angle of the second magnet slot 12 is α3, the angle between the fourth sub-slot 24 and the sixth sub-slot 26 is α4, α4=k2×α3, k2 satisfies: 5.5≤k2≤5.9, can increase the area enclosed by the first magnet slot 11 and / or the second magnet slot 12, so that more magnets 300 are used, the magnetic reluctance torque is greater, which can improve the limiting speed and power density of the rotor 200, and make the high-order harmonic content in the main magnetic field of the motor smaller, which can reduce the noise and vibration of the motor and is beneficial to improving the NVH performance of the motor.

[0093] In some embodiments, the motor can be applied to new energy vehicles. By using α2 = k1α1, where k1 satisfies 2.1 ≤ k1 ≤ 2.5, the motor can meet the requirements of ultra-high speed (e.g., above 30,000 rpm), possess ultra-high power density, and also maintain excellent NVH performance, thus meeting the operating requirements of motors in new energy vehicles. For example, the motor can be a permanent magnet synchronous motor.

[0094] The rotor lamination 100, rotor 200, motor, electric assembly, and other components and operations of the vehicle according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0095] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0096] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0097] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor lamination, characterized in that, The rotor lamination (100) is provided with a plurality of magnet slot groups (10), which are spaced apart in the circumferential direction of the rotor lamination (100). Each magnet slot group (10) includes: The first magnetic steel groove (11) includes a first sub-groove (21) and a third sub-groove (23) spaced apart. The polar arc angle of the first magnetic steel groove (11) is α1, and the angle between the first sub-groove (21) and the third sub-groove (23) is α2, where α2 = k1 × α1, and k1 satisfies: 2.1 ≤ k1 ≤ 2.5; And / or, a second magnetic steel groove (12), the second magnetic steel groove (12) includes a fourth sub-groove (24) and a sixth sub-groove (26) spaced apart, the polar arc angle of the second magnetic steel groove (12) is α3, the angle between the fourth sub-groove (24) and the sixth sub-groove (26) is α4, α4=k2×α3, where k2 satisfies: 5.5≤k2≤5.

9.

2. The rotor lamination according to claim 1, characterized in that, α1=(k3×180°) / p, where k3 satisfies: 0.55≤k3≤0.65, and p is the number of poles of the motor.

3. The rotor lamination according to claim 1, characterized in that, Along the radially outward direction of the rotor lamination (100), the first sub-slot (21) and the third sub-slot (23) extend obliquely away from each other, and the angle between the straight segments of the first sub-slot (21) and the third sub-slot (23) close to each other is formed as the angle of the first magnet slot (11).

4. The rotor lamination according to claim 3, characterized in that, The first magnetic groove (11) also includes: The second sub-slot (22) is located between the radial inner ends of the first sub-slot (21) and the third sub-slot (23).

5. The rotor lamination according to claim 4, characterized in that, There are two second sub-slots (22), which are spaced apart between the first sub-slot (21) and the third sub-slot (23), and a reinforcing rib (231) is provided between the two second sub-slots (22).

6. The rotor lamination according to any one of claims 1-5, characterized in that, Along the radially outward direction of the rotor lamination (100), the fourth sub-slot (24) and the sixth sub-slot (26) extend obliquely away from each other, and the angle between the straight segments of the fourth sub-slot (24) and the sixth sub-slot (26) close to each other forms the angle of the second magnet slot (12).

7. The rotor lamination according to claim 6, characterized in that, The second magnetic groove (12) also includes: The fifth sub-slot (25) is located between the radial inner ends of the fourth sub-slot (24) and the sixth sub-slot (26).

8. The rotor lamination according to any one of claims 1-5, characterized in that, α3=(k4×180°) / p, where k4 satisfies: 0.3≤k4≤0.35, and p is the number of poles of the motor.

9. The rotor lamination according to claim 1, characterized in that, Each of the said magnet slot groups (10) also includes: The third magnet slot is provided on at least one side of the first magnet slot (11) along the radial direction of the rotor lamination (100), either the radial inner side or the radial outer side.

10. The rotor lamination according to any one of claims 1-5, characterized in that, When the magnet slot group (10) includes a first magnet slot (11) and a second magnet slot (12), the second magnet slot (12) is located on the radial outer side of the first magnet slot (11) along the radial direction of the rotor lamination (100).

11. A rotor, characterized in that, Includes rotor laminations (100) according to any one of claims 1-10.

12. An electric motor, characterized in that, Includes the rotor (200) according to claim 11.

13. An electric powertrain, characterized in that, Includes the motor according to claim 12.

14. A vehicle, characterized in that, Includes the electric assembly according to claim 13, or includes the motor according to claim 12.

Images