Rotor punching sheet, electric motor, and vehicle

Abstract

The present application relates to a rotor punching sheet, an electric motor, and a vehicle. The rotor punching sheet comprises a shaft hole and a plurality of magnetic pole portions, wherein the shaft hole is located in the center of the rotor punching sheet; the plurality of magnetic pole portions are arranged at intervals in the circumferential direction of the shaft hole; each magnetic pole portion comprises a plurality of first magnetic steel slots for accommodating magnetic steel; the plurality of first magnetic steel slots are arranged at intervals in the radial direction of the rotor punching sheet; and in the radial direction of the rotor punching sheet, the thickness of the first magnetic steel slot in the plurality of first magnetic steel slots that is closest to the shaft hole is the maximum.

Description

Rotor lamination, motor and vehicle

[0001] This application claims priority to the Chinese patent application No. 202410903025.6, filed on July 05, 2024 in the China Patent Office, and entitled "Rotor lamination, rotor, motor and vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric machines, in particular to a rotor lamination, a motor and a vehicle. BACKGROUND

[0003] As one of the cores of the driving system, the electric machine is widely used in transportation, construction, industry and other fields. Among them, the built-in permanent magnet synchronous motor has additional reluctance torque, has the characteristics of large output torque and strong flux weakening capability, and is very popular in the field of electric vehicles.

[0004] The output torque of the electric machine includes electromagnetic torque and reluctance torque. The electromagnetic torque is the torque generated by the interaction of the stator magnetic field and the rotor magnetic field, and the reluctance torque is the torque generated by the difference in reluctance (or inductance) of the rotor direct axis and the cross axis. TECHNICAL PROBLEM

[0005] However, without reducing the reluctance torque, the electromagnetic torque in the limited space of the rotor is small, resulting in a small total output torque of the electric machine. TECHNICAL SOLUTION

[0006] To solve the above problems, the present application provides a rotor lamination, which optimizes the structure of the rotor lamination to increase the fillable amount of magnetic steel in the limited space of the rotor lamination under the condition of a larger reluctance torque, thereby increasing the electromagnetic torque and the output torque of the electric machine. In addition, the present application also provides a rotor, a motor and a vehicle equipped with the rotor lamination, which specifically includes the following solutions:

[0007] In a first aspect, the present application provides a rotor lamination, comprising a shaft hole and a plurality of magnetic pole portions. The shaft hole is located at the center of the rotor lamination, and the plurality of magnetic pole portions are arranged in a circumferential direction of the shaft hole. Each magnetic pole portion comprises a plurality of first magnetic steel grooves for accommodating magnetic steel. The plurality of first magnetic steel grooves are arranged in a radial direction of the rotor lamination, and the thickness of the first magnetic steel groove closer to the shaft hole among the plurality of first magnetic steel grooves is greater in the radial direction of the rotor lamination.

[0008] In an embodiment, the magnetic pole portion comprises a plurality of second magnetic steel grooves for accommodating magnetic steel. The plurality of second magnetic steel grooves are arranged on both sides of the plurality of first magnetic steel grooves. One second magnetic steel groove is arranged on each side of each first magnetic steel groove, and the two second magnetic steel grooves on each side of each first magnetic steel groove intersect with the extension line of the end closer to the shaft hole.

[0009] In one embodiment, the included angle between the two second magnetic steel slots on each side of the first magnetic steel slot is α, and π / p<α<2π / p, where p is the number of motor pole pairs.

[0010] In one embodiment, among the plurality of second magnetic steel slots on the same side of the plurality of first magnetic steel slots, the closer to the shaft hole, the greater the thickness of the second magnetic steel slot.

[0011] In one embodiment, the magnetic pole part comprises a third magnetic steel slot for accommodating a magnetic steel, and the third magnetic steel slot is located on the side away from the shaft hole of the plurality of first magnetic steel slots along the radial direction of the rotor lamination.

[0012] In one embodiment, the third magnetic steel slot is in the form of a strip, and the third magnetic steel slot is arranged in parallel with the first magnetic steel slot; or,

[0013] The third magnetic steel slot comprises two first sub-magnetic steel slots, and the two first sub-magnetic steel slots are arranged in the form of a V shape, and the included angle of the two first sub-magnetic steel slots is β, where 2π / p<β<π, and p is the number of motor pole pairs; or,

[0014] The third magnetic steel slot is in the form of an arc, and the curvature of the third magnetic steel slot is β, where 2π / p<β<π, and p is the number of motor pole pairs.

[0015] In one embodiment, the magnetic pole part comprises a fourth magnetic steel slot for accommodating a magnetic steel, and the fourth magnetic steel slot is located between the third magnetic steel slot and the plurality of first magnetic steel slots, the number of the fourth magnetic steel slot is one, and the fourth magnetic steel slot is in the form of a U shape; or,

[0016] The number of the fourth magnetic steel slot is two, and the two fourth magnetic steel slots are arranged in the form of a V shape.

[0017] In one embodiment, on the end surface of the rotor lamination, the rotor lamination comprises a direct axis and a cross axis, the direct axis is the center symmetry axis of the plurality of first magnetic steel slots, the cross axis is the perpendicular bisector between the adjacent two magnetic pole parts, the intersection point of the direct axis and the outer edge of the rotor lamination is M, the length of the perpendicular line passing through the M point is L MN , and the thickness H min of the second magnetic steel slot with the smallest thickness in the plurality of second magnetic steel slots is greater than L MN / (2n+1), where n is half of the number of second magnetic steel slots in each magnetic pole part.

[0018] In one embodiment, in the direction from the shaft hole to the outer edge of the rotor lamination, the thicknesses of the respective first magnetic steel slots in the plurality of first magnetic steel slots are H1, H2, H3, …, respectively, and H1:H2:H3:…=2H min :5 / 3H min :4 / 3H min :….

[0019] In an embodiment, a reinforcing rib is arranged between each first magnetic steel slot and each second magnetic steel slot, and the reinforcing rib is used to improve the strength of the rotor lamination.

[0020] In an embodiment, the minimum width of the reinforcing rib gradually increases from the outer edge of the rotor lamination towards the shaft hole.

[0021] In an embodiment, the minimum width of each reinforcing rib in the plurality of reinforcing ribs gradually increases from the shaft hole towards the outer edge of the rotor lamination, and the minimum width of each reinforcing rib is W1, W2, W3, …, respectively, and 4 / 3 < W1 / W2 < 2, 11 / 10 < W2 / W3 < 6 / 5.

[0022] In an embodiment, part of the first magnetic steel slots comprises two second sub-magnetic steel slots, and the two second sub-magnetic steel slots are arranged in a V shape, and the included angle of the two second sub-magnetic steel slots is γ, where 2π / p < γ < π, and p is the pole pair number of the motor.

[0023] In an embodiment, the rotor lamination is provided with a weight-reducing hole penetrating along the axial direction of the rotor lamination, and the weight-reducing hole is located on the side of the plurality of first magnetic steel slots away from the shaft hole.

[0024] In a second aspect, the application provides an electric motor, comprising a stator; and

[0025] a rotor comprising a plurality of magnetic steels, and the rotor lamination as in any one of the above embodiments; or

[0026] the rotor lamination as in any one of the above embodiments, wherein the stator surrounds the periphery of the rotor lamination.

[0027] In a third aspect, the application provides a vehicle, comprising a vehicle body and the electric motor as in any one of the above embodiments, wherein the electric motor is fixed to the vehicle body. Advantages

[0028] The application improves the arrangement position of the plurality of first magnetic steel slots in the rotor lamination, and optimizes the structure of the plurality of first magnetic steel slots, so as to ensure that the fillable amount of the magnetic steels in the rotor lamination is increased in the limited space of the rotor lamination under the condition of a larger magnetic drag torque, thereby further increasing the electromagnetic torque provided by the magnetic steels in the first magnetic steel slots, and improving the output torque. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described in the following are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0030] Fig. 1 is a schematic view of a transverse cross-section structure of a rotor provided in an embodiment of the present application;

[0031] Fig. 2 is a schematic view of a structure of a rotor lamination provided in an embodiment of the present application;

[0032] Fig. 3 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a first embodiment of the present application;

[0033] Fig. 4 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a second embodiment of the present application;

[0034] Fig. 5 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a third embodiment of the present application;

[0035] Fig. 6 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a fourth embodiment of the present application;

[0036] Fig. 7 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a fifth embodiment of the present application;

[0037] Fig. 8 is a block diagram of a structure of a vehicle provided in an embodiment of the present application.

[0038] Reference signs: 100-rotor; 10-magnetic steel; 20-rotor lamination; 21-axle hole; 22-magnetic pole part; 30-magnetic steel slot; 31-first magnetic steel slot; 311-second sub-magnetic steel slot; 32-second magnetic steel slot; 33-third magnetic steel slot; 331-first sub-magnetic steel slot; 34-fourth magnetic steel slot; 40-stiffener; 50-weight-reducing hole.

[0039] Embodiments of the present application

[0040] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings.

[0041] The motor provided in the present application can be applied in a vehicle, and the motor comprises a stator and a rotor, the stator surrounds the periphery of the rotor, and the rotor can be composed of a plurality of magnetic steels and a plurality of rotor laminations. The vehicle can be an electric vehicle, and the motor can be used as a driving motor to provide driving force for the vehicle to run. At this time, since the driving motor is in a high-speed working state, and due to the limitation of the yield strength of silicon steel sheets, the driving motor can only be designed in the direction of miniaturization.

[0042] Please refer to Figs. 1 to 3, wherein Fig. 1 is a schematic view of a transverse cross-section structure of a rotor provided in an embodiment of the present application; Fig. 2 is a schematic view of a structure of a rotor lamination provided in an embodiment of the present application; and Fig. 3 is a schematic view of a structure of one magnetic pole part of a rotor lamination provided in a first embodiment of the present application.

[0043] As shown in FIGS. 1-3, the rotor 100 provided by the present application includes the magnetic steel 10 and the rotor lamination 20. The rotor 100 of the motor is an inner rotor, i.e., the magnetic steel 10 is filled in the rotor lamination 20, and the magnetic field generated by the magnetic steel 10 can interact with the magnetic field of the stator of the motor to form an electromagnetic torque. From the perspective of the rotor 100 of the motor, the electromagnetic torque of the motor is mainly determined by the characteristics of the magnetic steel 10 itself. In the present application, the rotor lamination 20 includes a shaft hole 21 and a magnetic pole portion 22. The shaft hole 21 is located at the center of the rotor lamination 20 and is used to install the rotating shaft of the motor. The magnetic pole portion 22 is a plurality of magnetic pole portions, and the plurality of magnetic pole portions 22 are arranged along the circumferential direction of the shaft hole 21 and are used to generate a magnetic field. The number of the magnetic pole portions 22 is even. In the embodiment shown in FIG. 1, the number of the magnetic pole portions 22 is 8, and the number of pole pairs of the motor is 4. Each magnetic pole portion 22 is formed with a plurality of magnetic steel grooves 30, and the plurality of magnetic steel grooves 30 penetrate the body of the rotor lamination 20 along the axial direction of the rotor lamination 20 to accommodate the filled magnetic steel 10.

[0044] It should be noted that, due to the fact that the magnetic permeability of air in the magnetic steel groove 30 is lower than the magnetic permeability of the body of the rotor lamination 20, the magnetic steel groove 30 can be configured as a magnetic barrier on the rotor lamination 20. The existence of the magnetic barrier can reduce the magnetic flux in the corresponding direction, so that the magnetic resistance at the direct axis (d-axis, the central symmetry axis of each magnetic pole portion 22 along the radial direction of the rotor lamination 20) and the quadrature axis (q-axis, the perpendicular bisector between adjacent two magnetic pole portions 22) of each magnetic pole portion 22 is different, thereby generating a reluctance torque. It can be understood that, from the perspective of the rotor 100, the reluctance torque of the motor is mainly determined by the number of layers of the magnetic barrier.

[0045] The plurality of magnetic steel grooves 30 includes a first magnetic steel groove 31, and the number of the first magnetic steel groove 31 is a plurality. The plurality of first magnetic steel grooves 31 are arranged along the radial direction of the rotor lamination 20. Each first magnetic steel groove 31 can be symmetrical about the direct axis. It can be understood that, the plurality of first magnetic steel grooves 31 are arranged along the radial direction of the rotor lamination 20 in a targeted manner, so as to reasonably form multiple layers of magnetic barriers in the limited space of the rotor lamination 20, thereby increasing the magnetic resistance at the central symmetry axis of each magnetic pole portion 22, increasing the difference between the magnetic resistance at the central symmetry axis of each magnetic pole portion 22 and the perpendicular bisector between adjacent magnetic pole portions 22, and further improving the reluctance torque.

[0046] Further, along the radial direction of the rotor lamination 20, the thickness of the first magnetic steel slots 31 closer to the shaft hole 21 is greater. That is, from the outer edge of the rotor lamination 20 to the shaft hole 21, the thickness of the first magnetic steel slots 31 increases, so that the volume of the first magnetic steel slots 31 is increased to accommodate more magnetic steel 10, thereby maximizing the electromagnetic torque in the limited space of the rotor lamination 20. In addition, since the heavier part of the first magnetic steel slots 31 filled with magnetic steel 10 is close to the shaft hole 21 of the rotor lamination 20, and the lighter part is close to the outer edge of the rotor lamination 20, the centrifugal stress of the magnetic steel 10 in the first magnetic steel slots 31 is small when the rotor lamination 20 rotates, thereby avoiding damage to the rotor lamination 20.

[0047] It can be understood that, by reasonably designing the arrangement position of the first magnetic steel slots 31 in the rotor lamination 20 and optimizing the structure of the first magnetic steel slots 31, the fillable amount of the magnetic steel 10 in the limited space of the rotor lamination 20 is increased, thereby further increasing the electromagnetic torque provided by the magnetic steel 10 in the first magnetic steel slots 31, and the output torque is improved.

[0048] It should be noted that, since the magnetic permeability of the magnetic steel 10 is not much different from that of air, filling the magnetic steel 10 into the magnetic steel slot 30 does not affect the original performance of the magnetic barrier, that is, the magnetic reluctance torque generated by the magnetic steel slot 30 is not affected.

[0049] It should be noted that, the number of the magnetic pole portions 22 in the above embodiment is only an exemplary introduction, that is, the number of the magnetic pole portions 22 includes but is not limited to 8, and only needs to be an even number, which is not particularly limited in the present application. For example, the number of the magnetic pole portions 22 can be 6 or 4, and the pole pair number of the motor is 3 and 2, respectively.

[0050] In an embodiment, the magnetic steel slot 30 of each magnetic pole portion 22 includes a second magnetic steel slot 32, the number of the second magnetic steel slots 32 is multiple, the second magnetic steel slot 32 can be used to accommodate the magnetic steel 10, and the multiple second magnetic steel slots 32 are arranged on both sides of the multiple first magnetic steel slots 31. One second magnetic steel slot 32 is arranged on each side of each first magnetic steel slot 31, the two second magnetic steel slots 32 on each side of each first magnetic steel slot 31 are symmetrical about the direct axis, and the two second magnetic steel slots 32 on each side of each first magnetic steel slot 31 intersect the extension line of the end close to the shaft hole 21. That is, the two second magnetic steel slots 32 on each side of each first magnetic steel slot 31 are arranged in a V shape.

[0051] It can be understood that in the embodiment, one second magnetic steel slot 32 is arranged on each side of each first magnetic steel slot 31, and each two second magnetic steel slots 32 correspond to one first magnetic steel slot 31 to form a magnetic barrier layer, so as to improve the reluctance torque of the motor. Meanwhile, the second magnetic steel slot 32 can be filled with the magnetic steel 10 to improve the electromagnetic torque of the motor. Further, the two second magnetic steel slots 32 arranged on each side of each first magnetic steel slot 31 are arranged in a V shape, which can improve the magnetic concentration effect and is beneficial to improve the performance of the motor.

[0052] Please refer to FIG. 4, which is a structural schematic diagram of one magnetic pole part of a rotor lamination provided in a second embodiment of the application.

[0053] As shown in FIG. 4, in one embodiment, among the plurality of second magnetic steel slots 32 arranged on the same side of the plurality of first magnetic steel slots 31, the thickness of the second magnetic steel slot 32 closer to the shaft hole 21 is greater. It can be understood that, based on the thickness of the first magnetic steel slot 31 closer to the shaft hole 21 in the plurality of first magnetic steel slots 31, the thickness of the second magnetic steel slot 32 closer to the shaft hole 21 is also greater in the embodiment, which can not only ensure the uniformity of the magnetic barrier, but also further increase the space for filling the magnetic steel 10 in the second magnetic steel slot 32 under the condition that the number of magnetic barrier layers is fixed, so that the number of magnetic steels 10 filled in each magnetic pole part 22 is greater, thereby improving the electromagnetic torque of the motor. In addition, the centrifugal stress of the magnetic steel 10 filled in the second magnetic steel slot 32 is smaller, which ensures the service life of the magnetic steel 10.

[0054] In the above embodiment, the second magnetic steel slot 32 is strip-shaped, and the second magnetic steel slot 32 extends along the radial direction of the rotor lamination 20, that is, the second magnetic steel slot 32 is parallel to the radial direction of the rotor lamination 20. It can be understood that, by arranging the second magnetic steel slot 32 parallel to the radial direction of the rotor lamination 20, the stress on each part of the rotor lamination 20 can be uniform when the rotor 100 rotates, the structural stability of the rotor lamination 20 can be ensured, and the space utilization of the rotor lamination 20 can be improved. In other embodiments, the second magnetic steel slot 32 can be arranged not parallel to the radial direction of the rotor lamination 20. Please refer to FIG. 5, which is a structural schematic diagram of one magnetic pole part of a rotor lamination provided in a third embodiment of the application.

[0055] As shown in Fig. 5, in an embodiment, the second magnetic steel slot 32 is also strip-shaped, and the second magnetic steel slot 32 is arranged at an angle with the radial direction of the rotor lamination 20. In this application, the second magnetic steel slot 32 extends from the direction close to the straight shaft to the direction away from the straight shaft along the axial hole 21 towards the outer edge of the rotor lamination 20. At this time, by reasonably arranging the relative positions between the first magnetic steel slot 31 and the second magnetic steel slot 32, the structural stability of the rotor lamination 20 and the high space utilization can also be ensured, and in addition, the magnetic concentration effect can be improved, which is conducive to improving the performance of the motor.

[0056] In an embodiment, in each layer of the magnetic barrier, the included angle between the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 is α, and π / p < α < 2π / p, where p is the pole pair number of the motor. For example, in the embodiment shown in Fig. 1, the pole pair number p of the motor is 4, and at this time, the included angle α is in the range of π / 4 < α < π / 2. It can be understood that by setting the included angle α between the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 to be in the range of π / p < α < 2π / p, on the one hand, the included angle α can be prevented from being too small, and the width of the second magnetic steel slot 32 is small, and the torque power is low; on the other hand, the included angle α can be prevented from being too large, and the utilization rate of the magnetic steel 10 filled in the second magnetic steel slot 32 is low, thereby affecting the electromagnetic torque and the reluctance torque.

[0057] In an embodiment, the magnetic steel slot 30 of each magnetic pole part 22 includes a third magnetic steel slot 33, and the number of the third magnetic steel slot 33 is one, and the third magnetic steel slot 33 is located on the side away from the axial hole 21 of the plurality of first magnetic steel slots 31 along the radial direction of the rotor lamination 20. It can be understood that by arranging the third magnetic steel slot 33 on the side away from the axial hole 21 of the plurality of first magnetic steel slots 31, the remaining space of the rotor lamination 20 can be further utilized, and the capacity of the magnetic steel 10 that can be filled in the rotor lamination 20 is increased, thereby further improving the electromagnetic torque.

[0058] In the embodiment shown in FIG. 3, the third magnetic slot 33 is in a strip shape, and the third magnetic slot 33 is arranged in parallel with the first magnetic slot 31, that is, the length direction of the third magnetic slot 33 is perpendicular to the radial direction of the rotor lamination 20. In the embodiments shown in FIG. 5 and FIG. 6 (FIG. 6 is a structural schematic diagram of one of the magnetic pole portions of the rotor lamination provided in the fourth embodiment of the present application), the third magnetic slot 33 includes two first sub-magnetic slots 331, and the two first sub-magnetic slots 331 are arranged in a V shape and are symmetrical about the straight axis. The included angle between the two first sub-magnetic slots 331 is β, where 2π / p<β<π, and p is the pole pair number of the motor. It can be understood that the included angle β between the two first sub-magnetic slots 331 is set in the range of 2π / p<β<π, on the one hand, it can avoid that the included angle β is too small, the width of the first sub-magnetic slot 331 is small, and the torque power is low; on the other hand, it can avoid that the included angle β is too large, the utilization rate of the magnetic steel 10 filled in the first sub-magnetic slot 331 is low, thereby affecting the electromagnetic torque and the reluctance torque.

[0059] In another embodiment, please refer to FIG. 7, which is a structural schematic diagram of one of the magnetic pole portions of the rotor lamination provided in the fifth embodiment of the present application, the third magnetic slot 33 can be in an arc shape, and the arc of the third magnetic slot 33 is β, where 2π / p<β<π, and p is the pole pair number of the motor. Similarly, the arc β of the third magnetic slot 33 is set in the range of 2π / p<β<π, on the one hand, it can avoid that the included angle β is too small, the width of the third magnetic slot 33 is small, and the torque power is low; on the other hand, it can avoid that the included angle β is too large, the utilization rate of the magnetic steel 10 filled in the third magnetic slot 33 is low, thereby affecting the electromagnetic torque and the reluctance torque.

[0060] Please refer back to FIG. 3, in an embodiment, the magnetic slot 30 of each magnetic pole portion 22 further includes a fourth magnetic slot 34, and the number of the fourth magnetic slot 34 is one. The fourth magnetic slot 34 is located between the third magnetic slot 33 and the plurality of first magnetic slots 31, and at this time, the fourth magnetic slot 34 can be arranged in a U shape. It can be understood that the fourth magnetic slot 34 is arranged in the space between the third magnetic slot 33 and the first magnetic slot 31, which can increase the number of magnetic barrier layers of the rotor lamination 20, and at the same time, it can also increase the space for filling the magnetic steel 10, thereby further improving the reluctance torque and the electromagnetic torque. Further, the fourth magnetic slot 34 is arranged in a U shape, which can ensure the integrity of the magnetic barrier formed by the fourth magnetic slot 34.

[0061] In the embodiments shown in FIG. 5 and FIG. 7, the number of the fourth magnetic slot 34 is two, and the two fourth magnetic slots 34 are both located between the third magnetic slot 33 and the first magnetic slot 31, and the two fourth magnetic slots 34 are arranged in a V shape. At this time, it can not only increase the number of magnetic barrier layers, but also increase the space for filling the magnetic steel 10, and in addition, it can also improve the magnetic aggregation effect.

[0062] Referring to FIG. 3, in an embodiment, the rotor lamination 20 comprises a direct axis and a quadrature axis on the end surface of the rotor lamination 20. The direct axis is the central symmetry axis of the plurality of first magnetic steel grooves 31, i.e., the d-axis. The quadrature axis is the perpendicular bisector between two adjacent magnetic pole portions 22, i.e., the q-axis. The intersection of the direct axis and the outer edge of the rotor lamination 20 is M, and the intersection of the perpendicular line passing through the point M on the quadrature axis and the quadrature axis is N. The length of the perpendicular line is L MN , and the thickness H min of the second magnetic steel groove 32 with the smallest thickness among the plurality of second magnetic steel grooves 32 is greater than L MN / (2n+1), where n is half of the number of the second magnetic steel grooves 32 in each magnetic pole portion 22.

[0063] In the embodiment, the thickness H min of the second magnetic steel groove 32 with the smallest thickness is in the range of L MN / (2n+1), which can ensure that each second magnetic steel groove 32 has sufficient space to fill the magnetic steel 10, thereby ensuring the filling amount of the magnetic steel 10.

[0064] For example, in an embodiment, from the direction of the shaft hole 21 towards the outer edge of the rotor lamination 20, the thicknesses of the plurality of first magnetic steel grooves 31 are H1, H2, H3, …, respectively, and H1:H2:H3:…=2H min :5 / 3H min :4 / 3H min :…. It can be understood that the thickness relationship between the plurality of first magnetic steel grooves 31 is set to satisfy H1:H2:H3:…=2H min :5 / 3H min :4 / 3H min :…, which can not only increase the filling amount of the magnetic steel 10 in the rotor lamination 20 to improve the electromagnetic torque, but also ensure that the area relatively far from the shaft hole 21 in the rotor lamination 20 is subjected to smaller centrifugal stress, thereby improving the strength of the rotor lamination 20.

[0065] In an embodiment, a reinforcing rib 40 is arranged between each first magnetic steel groove 31 and each second magnetic steel groove 32. The reinforcing rib 40 can be used to improve the strength of the rotor lamination 20 and ensure the service life of the rotor lamination 20.

[0066] In the present application, the minimum width of the reinforcing rib 40 gradually increases from the direction of the outer edge of the rotor lamination 20 towards the shaft hole 21. This design can not only ensure that the rotor lamination 20 can be provided with more first magnetic steel grooves 31 and second magnetic steel grooves 32, but also avoid stress concentration in the area of the rotor lamination 20 close to the shaft hole 21, thereby preventing the rotor lamination 20 from cracking and breaking.

[0067] Exemplarily, from the direction of the shaft hole 21 towards the outer edge of the rotor lamination 20, the minimum width of each of the plurality of reinforcing ribs 40 is W1, W2, W3, …, respectively, and 4 / 3 < W1 / W2 < 2, 11 / 10 < W2 / W3 < 6 / 5.

[0068] Please refer to FIG. 6, in an embodiment, part of the first magnetic steel slots 31 includes two second sub magnetic steel slots 311. In this application, the first magnetic steel slots 31 relatively close to the shaft hole 21 include two second sub magnetic steel slots 311. The two second sub magnetic steel slots 311 are arranged in a V shape, and the included angle of the two second sub magnetic steel slots 311 is γ, where 2π / p < γ < π, p is the pole pair number of the motor.

[0069] It can be understood that the arrangement of part of the first magnetic steel slots 31 including two second sub magnetic steel slots 311 arranged in a V shape is conducive to simplifying the manufacturing process of the rotor lamination 20 and improving the magnetic aggregation effect of the first magnetic steel slots 31. In addition, the size range of the included angle γ of the two second sub magnetic steel slots 311 is set between 2π / p < γ < π, which can avoid the included angle γ being too small, the width of the second sub magnetic steel slot 311 being too small, and the torque power being low, and can also avoid the included angle γ being too large, the utilization rate of the magnetic steel 10 filled in the second sub magnetic steel slot 311 being low, thereby affecting the electromagnetic torque and the reluctance torque.

[0070] In the embodiment shown in FIG. 6, the rotor lamination 20 is provided with a weight-reducing hole 50 penetrating along the axial direction of the rotor lamination 20, the weight-reducing hole 50 is located on the side of the plurality of first magnetic steel slots 31 away from the shaft hole 21, and is located on the side of the third magnetic steel slot 33 away from the shaft hole 21, that is, the weight-reducing hole 50 is arranged relatively close to the outer edge of the rotor lamination 20. It can be understood that the design of the weight-reducing hole 50 can not only reduce the weight of the rotor lamination 20, but also can be used as an oil leakage hole to guide the lubricating oil to infiltrate the rotor 100, thereby improving the lubrication effect of the rotor 100. In addition, by arranging the weight-reducing hole 50 on the side of the plurality of first magnetic steel slots 31 away from the shaft hole 21, the weight of the outer edge of the rotor lamination 20 can be reduced, thereby reducing the negative impact of the centrifugal stress.

[0071] It should be noted that the position of the weight-reducing hole 50 in the above-mentioned embodiments is only an exemplary introduction, for example, in the embodiments shown in FIG. 5 and FIG. 7, the weight-reducing hole 50 can be located between the third magnetic steel slot 33 and the fourth magnetic steel slot 34 along the radial direction of the rotor lamination 20, which also has the same beneficial effects as described above.

[0072] In one embodiment, the magnetic steel 10 filled in each magnetic steel slot 30 is a ferrite magnetic steel. Through the optimization design of the magnetic steel slot 30 described above, and based on the low cost of the ferrite magnetic steel, the application adopts the ferrite magnetic steel filling, compared with the scheme of mixed filling of the rare earth magnetic steel and the ferrite magnetic steel in the prior art, not only the same output torque as the prior art can be reached, but also the cost can be greatly reduced.

[0073] Please refer to FIG. 8, which is a structural block diagram of a vehicle provided in an embodiment of the application. The application provides a vehicle, which comprises a vehicle body and an electric machine as described above, wherein the electric machine is fixed to the vehicle body.

Claims

1. A rotor lamination (20) comprising: a shaft hole (21) located in the center of the rotor lamination (20) ; a plurality of magnetic pole portions (22) arranged in a circumferential direction of the shaft hole (21), each of the magnetic pole portions (22) comprising: a plurality of first magnetic steel grooves (31) for accommodating magnetic steels (10), the plurality of first magnetic steel grooves (31) being arranged in a radial direction of the rotor lamination (20), and the first magnetic steel groove (31) closer to the shaft hole (21) being thicker than the first magnetic steel groove (31) farther from the shaft hole (21).

2. The rotor lamination (20) of claim 1, wherein The magnetic pole portion (22) comprises a plurality of second magnetic steel grooves (32) for accommodating magnetic steels (10), the plurality of second magnetic steel grooves (32) being arranged on both sides of the plurality of first magnetic steel grooves (31), one second magnetic steel groove (32) being arranged on each side of each first magnetic steel groove (31), and the two second magnetic steel grooves (32) on each side of each first magnetic steel groove (31) intersecting at an extension line of an end closer to the shaft hole (21).

3. The rotor lamination (20) of claim 2, wherein, An included angle between the two second magnetic steel grooves (32) on each side of each first magnetic steel groove (31) is α, and π / p < α < 2π / p, where p is the number of pole pairs of the motor.

4. The rotor lamination (20) of claim 2, wherein, The second magnetic steel groove (32) closer to the shaft hole (21) is thicker than the second magnetic steel groove (32) farther from the shaft hole (21) among the plurality of second magnetic steel grooves (32) on the same side of the plurality of first magnetic steel grooves (31).

5. The rotor lamination (20) of claim 2, wherein, The magnetic pole portion (22) comprises a third magnetic steel groove (33) for accommodating a magnetic steel (10), the third magnetic steel groove (33) being located on a side of the plurality of first magnetic steel grooves (31) away from the shaft hole (21) in the radial direction of the rotor lamination (20).

6. The rotor lamination (20) of claim 5, wherein The third magnetic steel groove (33) is in a strip shape, and the third magnetic steel groove (33) is arranged in parallel with the first magnetic steel groove (31) ; or The third magnetic steel groove (33) comprises two first sub-magnetic steel grooves (331), the two first sub-magnetic steel grooves (331) being arranged in a V shape, and an included angle between the two first sub-magnetic steel grooves (331) is β, where 2π / p < β < π, and p is the number of pole pairs of the motor; or The third magnetic steel groove (33) is in an arc shape, and an arc of the third magnetic steel groove (33) is β, where 2π / p < β < π, and p is the number of pole pairs of the motor.

7. The rotor lamination (20) of claim 5, wherein, The magnetic pole portion (22) comprises a fourth magnetic steel groove (34) for accommodating a magnetic steel (10), the fourth magnetic steel groove (34) being located between the third magnetic steel groove (33) and the plurality of first magnetic steel grooves (31), the number of the fourth magnetic steel groove (34) being one, and the fourth magnetic steel groove (34) being in a U shape; or The number of the fourth magnetic steel groove (34) is two, and the two fourth magnetic steel grooves (34) are arranged in a V shape.

8. The rotor lamination (20) of claim 2, wherein, On the end surface of the rotor lamination (20), the rotor lamination (20) comprises a direct axis and a transverse axis, the direct axis is the central symmetry axis of the plurality of first magnetic steel grooves (31), the transverse axis is the perpendicular bisector between adjacent two magnetic pole portions (22), the intersection point of the direct axis and the outer edge of the rotor lamination (20) is M, and the length of the perpendicular line passing through the M point of the transverse axis is L MN The thickness H of the second magnetic steel groove (32) with the smallest thickness in the plurality of second magnetic steel grooves (32) min > L MN / (2n+1), wherein n is half of the number of the second magnetic steel grooves (32) in each magnetic pole portion (22).

9. The rotor lamination (20) of claim 8, wherein, From the direction of the shaft hole (21) toward the outer edge of the rotor lamination (20), the thickness of each of the first magnetic steel grooves (31) is H1, H2, H3, …, respectively, and H1:H2:H3:…=2H min : 5 / 3H min : 4 / 3H min : … 10. The rotor lamination (20) of any of claims 2-9, wherein, A reinforcing rib (40) is arranged between each first magnetic steel groove (31) and each second magnetic steel groove (32), and the reinforcing rib (40) is used to improve the strength of the rotor lamination (20).

11. The rotor lamination (20) of claim 10, wherein From an outer edge of the rotor lamination (20) towards the shaft hole (21), a minimum width of the reinforcing rib (40) gradually increases.

12. The rotor lamination (20) of claim 11, wherein, The minimum width of each of the plurality of reinforcing ribs (40) from the shaft hole (21) to the outer edge of the rotor lamination (20) is W1, W2, W3, and 4 / 3 < W1 / W2 < 2, 11 / 10 < W2 / W3 < 6 / 5.

13. The rotor lamination (20) of any of claims 1 to 9, wherein, Part of the first magnetic steel groove (31) comprises two second sub-magnetic steel grooves (311), the two second sub-magnetic steel grooves (311) are arranged in a V shape, and the included angle of the two second sub-magnetic steel grooves (311) is γ, wherein 2π / p < γ < π, p is the pole pair number of the motor.

14. The rotor lamination (20) of any of claims 1 to 9, wherein, The rotor lamination (20) is provided with a weight-reducing hole (50) penetrating along the axial direction thereof, and the weight-reducing hole (50) is located on the side of the plurality of first magnetic steel grooves (31) away from the shaft hole (21).

15. An electric machine comprising: a stator; and a rotor (100) comprising a plurality of magnetic steel (10) and a rotor lamination (20) according to any one of claims 1 to 14; or a rotor lamination (20) according to any one of claims 1 to 14, wherein the stator is arranged around the periphery of the rotor lamination (20).

16. A vehicle comprising: a vehicle body; and an electric machine according to claim 15, the electric machine being fixed to the vehicle body.

Images