Rotor punching sheet, rotor, motor and vehicle

Abstract

The invention relates to a rotor punching sheet, a rotor, a motor and a vehicle, the rotor punching sheet comprises a shaft hole and a plurality of magnetic pole parts, the shaft hole is located in the center of the rotor punching sheet, the plurality of magnetic pole parts are arranged at intervals along the circumferential direction of the shaft hole, each magnetic pole part comprises a plurality of first magnetic steel grooves for accommodating magnetic steel, and the plurality of first magnetic steel grooves are arranged at intervals along the radial direction of the rotor punching sheet. And along the radial direction of the rotor punching sheet, the thickness of the first magnetic steel groove closer to the shaft hole in the plurality of first magnetic steel grooves is larger. According to the rotor punching sheet, the arrangement positions of the plurality of first magnetic steel grooves in the rotor punching sheet are reasonably designed, and the structures of the plurality of first magnetic steel grooves are optimized, so that the filling amount of the magnetic steel can be improved in a limited space of the rotor punching sheet under the condition that relatively large reluctance torque is ensured; therefore, the electromagnetic torque provided by the magnetic steel in the first magnetic steel groove is further increased, and the output torque is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to a rotor punching sheet, a rotor, an electric motor and a vehicle. Background Art

[0002] As one of the cores of the drive system, the motor is widely used in various fields such as transportation, construction, and industry. Among them, the built-in permanent magnet synchronous motor has additional reluctance torque. Compared with the surface-mounted permanent magnet synchronous motor, it has a larger output torque and stronger weak magnetic ability, and is more popular in fields such as electric vehicles.

[0003] The output torque of the motor includes electromagnetic torque and reluctance torque. The electromagnetic torque is the torque generated by the interaction between the stator magnetic field and the rotor magnetic field, and the reluctance torque is the torque generated by the unequal reluctance (or inductance) of the rotor direct axis and the quadrature axis. How to increase the electromagnetic torque as much as possible within the limited space of the rotor without reducing the reluctance torque, thereby improving the total output torque of the motor, is a difficult problem in the field of motor technology. Summary of the invention

[0004] In order to solve the above problems, the present application provides a rotor punching, which optimizes the structure of the rotor punching in a targeted manner, thereby ensuring that the amount of magnetic steel that can be filled in the limited space of the rotor punching is increased under the condition of large magnetic resistance torque, so as to increase the electromagnetic torque and thus increase the output torque of the motor. In addition, the present application also provides a rotor, a motor and a vehicle equipped with the rotor punching, which specifically include the following solutions:

[0005] In a first aspect, the present application provides a rotor punching, comprising an axial hole and a plurality of magnetic pole portions, wherein the axial hole is located at the center of the rotor punching, the plurality of magnetic pole portions are arranged at intervals along the circumference of the axial 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 at intervals along the radial direction of the rotor punching, and along the radial direction of the rotor punching, the thickness of the plurality of first magnetic steel grooves closer to the axial hole is greater.

[0006] The present application provides an axial hole in the rotor punching sheet for mounting the rotating shaft of the motor, and provides a plurality of magnetic pole portions for generating a magnetic field, wherein the number of magnetic pole portions is an even number. Specifically, a plurality of first magnetic steel slots are provided in each magnetic pole portion to accommodate magnetic steels that provide the magnetic field of the rotor, so as to interact with the magnetic field of the stator of the motor to generate an electromagnetic torque. At the same time, since the magnetic permeability of the first magnetic steel slot is lower than the magnetic permeability of the rotor punching sheet body, the first magnetic steel slot can be used as a part of the magnetic barrier to make a difference in the magnetic resistance between the direct axis and the quadrature axis, thereby generating a magnetic resistance torque. The plurality of first magnetic steel slots are arranged in a radially spaced manner along the rotor punching sheet to reasonably form a multi-layer magnetic barrier within the limited space of the rotor punching sheet, thereby increasing the magnetic resistance of the direct axis, increasing the difference between the direct axis and the quadrature axis, and thus improving the magnetic resistance torque.

[0007] Furthermore, by setting the thickness of the first magnetic steel slots closer to the shaft hole in the radial direction of the rotor punching sheet to be greater, that is, from the outer edge of the rotor punching sheet to the shaft hole, the thickness of the first magnetic steel slots is in an increasing form, so as to increase the volume of the first magnetic steel slots under the condition of a fixed number of magnetic barrier layers, so as to ensure that more magnetic steel can be accommodated, thereby maximizing the electromagnetic torque within the limited radial space of the rotor punching sheet. In addition, since the heavier parts of the first magnetic steel slots filled with magnetic steel are close to the shaft hole of the rotor punching sheet, and the lighter parts are close to the outer edge of the rotor punching sheet, it is ensured that when the rotor punching sheet rotates, the centrifugal stress on the magnetic steel in the first magnetic steel slot is smaller, thereby preventing the rotor punching sheet from being easily damaged.

[0008] It can be understood that the present application reasonably designs the arrangement positions of multiple first magnetic steel slots in the rotor punchings and optimizes the structures of multiple first magnetic steel slots, thereby ensuring that the filling amount of magnetic steel can be increased in the limited space of the rotor punchings while having a larger magnetic resistance torque, thereby further increasing the electromagnetic torque provided by the magnetic steel in the first magnetic steel slots and further improving the output torque.

[0009] In one embodiment, the magnetic pole portion includes a plurality of second magnetic steel grooves for accommodating magnetic steels, the plurality of second magnetic steel grooves are arranged on both sides of the plurality of first magnetic steel grooves, a second magnetic steel groove is arranged on both sides of each first magnetic steel groove, and the extension lines of the two second magnetic steel grooves on both sides of each first magnetic steel groove that are relatively close to one end of the shaft hole intersect.

[0010] In one embodiment, the angle between the two second magnetic steel slots on both sides of each first magnetic steel slot is α, and π / p<α<2π / p, where p is the number of motor pole pairs.

[0011] In one embodiment, among the plurality of second magnetic steel slots located on the same side of the plurality of first magnetic steel slots, the second magnetic steel slot closer to the shaft hole has a greater thickness.

[0012] In one embodiment, the magnetic pole portion includes a third magnetic steel slot for accommodating a magnetic steel, and the third magnetic steel slot is located on a side of the plurality of first magnetic steel slots away from the shaft hole along the radial direction of the rotor punching sheet.

[0013] In one embodiment, the third magnetic steel slot is in a strip shape, and the third magnetic steel slot is arranged parallel to the first magnetic steel slot; or,

[0014] The third magnetic steel slot includes two first sub-magnetic steel slots, the two first sub-magnetic steel slots are arranged in a V shape, and the angle between the two first sub-magnetic steel slots is β, wherein 2π / p<β<π, p is the number of motor pole pairs; or,

[0015] The third magnetic steel slot is arc-shaped, and the arc of the third magnetic steel slot is β, wherein 2π / p<β<π, and p is the number of motor pole pairs.

[0016] In one embodiment, the magnetic pole portion includes a fourth magnetic steel slot for accommodating a magnetic steel, 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 U-shaped; or,

[0017] The number of the fourth magnetic steel slots is two, and the two fourth magnetic steel slots are arranged in a V shape.

[0018] In one embodiment, at the end surface of the rotor punching, the rotor punching includes a direct axis and a cross axis, the direct axis is the central symmetry axis of the plurality of first magnetic steel slots, the cross axis is the perpendicular bisector between two adjacent magnetic poles, the intersection point of the direct axis and the outer edge of the rotor punching is M, and the length of the perpendicular line of the cross axis passing through point M is L MN , the thickness H of the second magnetic steel slot with the smallest thickness among the plurality of second magnetic steel slots min >L MN / (2n+1), where n is half the number of the second magnetic steel slots in each magnetic pole portion.

[0019] In one embodiment, from the shaft hole toward the outer edge of the rotor punching sheet, the thickness of each of the plurality of first magnetic steel slots is H1, H2, H3..., and H1:H2:H3:...=2H min :5 / 3H min :4 / 3H min :….

[0020] In one embodiment, a reinforcing rib is provided 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 punching sheet.

[0021] In one embodiment, the minimum width of the reinforcing ribs gradually increases from the outer edge of the rotor punching sheet toward the shaft hole.

[0022] In one embodiment, from the shaft hole toward the outer edge of the rotor punching sheet, the minimum width of each of the multiple reinforcement ribs is W1, W2, W3..., and 4 / 3<W1 / W2<2, 11 / 10<W2 / W3<6 / 5.

[0023] In one embodiment, part of the first magnetic steel slots includes two second sub-magnetic steel slots, the two second sub-magnetic steel slots are arranged in a V shape, and the angle between the two second sub-magnetic steel slots is γ, wherein 2π / p<γ<π, and p is the number of motor pole pairs.

[0024] In one embodiment, the rotor punching sheet is provided with a weight-reducing hole penetrating along its own axial direction, and the weight-reducing hole is located on the side of the plurality of first magnetic steel slots away from the shaft hole.

[0025] In a second aspect, the present application provides a rotor comprising a plurality of magnetic steels and a rotor punching as in any of the above embodiments.

[0026] In a third aspect, the present application provides a motor, comprising a stator and a rotor sheet or a rotor as in any of the above embodiments, wherein the stator surrounds the periphery of the rotor sheet.

[0027] In a fourth aspect, the present application provides a vehicle, comprising a vehicle body and a motor as in any of the above embodiments, wherein the motor is fixed to the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the transverse cross-sectional structure of a rotor provided in one embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the structure of a rotor punching provided in one embodiment of the present application;

[0031] Figure 3 A schematic structural diagram of one of the magnetic pole portions of a rotor punching provided in the first embodiment of the present application;

[0032] Figure 4 A schematic structural diagram of one of the magnetic pole portions of a rotor punching provided in a second embodiment of the present application;

[0033] Figure 5 A schematic structural diagram of one of the magnetic pole portions of a rotor punching provided in a third embodiment of the present application;

[0034] Figure 6 A schematic structural diagram of one of the magnetic pole portions of a rotor punching provided in a fourth embodiment of the present application;

[0035] Figure 7 This is a schematic structural diagram of one of the magnetic pole portions of a rotor punching provided in the fifth embodiment of the present application.

[0036] Figure numbers: 100-rotor; 10-magnetic steel; 20-rotor punching sheet; 21-shaft hole; 22-magnetic pole; 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-reinforcement rib; 50-weight reduction hole. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0038] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

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

[0042] Please see Figures 1 to 3 ,in Figure 1 This is a schematic diagram of a transverse cross-sectional structure of a rotor 100 provided in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a rotor punching sheet 20 provided in one embodiment of the present application; Figure 3 It is a schematic structural diagram of one of the magnetic pole portions 22 of the rotor punching 20 provided in the first embodiment of the present application.

[0043] like Figures 1 to 3 As shown, the rotor 100 provided in the present application includes a magnet 10 and a rotor punching 20. The rotor 100 of the motor is a built-in rotor, that is, the magnet 10 is filled and embedded in the rotor punching 20, and the magnetic field generated by the magnet 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 magnet 10 itself. Specifically, the rotor punching 20 includes an axial hole 21 and a magnetic pole portion 22. The axial hole 21 is located at the center of the rotor punching 20 and is used to install the rotating shaft of the motor. There are multiple magnetic pole portions 22, and the multiple magnetic pole portions 22 are arranged at circumferential intervals along the axial hole 21 to generate a magnetic field, wherein the number of magnetic pole portions 22 is an even number. Figure 1 In the embodiment shown, the number of 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 slots 30, which penetrate the body of the rotor punching 20 along the axial direction of the rotor punching 20 to accommodate the filling magnetic steel 10.

[0044] It should be noted that, since the magnetic permeability of the air in the magnetic steel slot 30 is lower than the magnetic permeability of the rotor sheet 20 body, the magnetic steel slot 30 can be constructed as a magnetic barrier on the rotor sheet 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 sheet 20) and the cross axis (q axis, the perpendicular bisector between two adjacent magnetic pole portions 22) of each magnetic pole portion 22 is different, thereby generating a magnetic resistance torque. It can be understood that from the perspective of the rotor 100, the magnetic resistance torque of the motor is mainly determined by the number of layers of the magnetic barrier.

[0045] The plurality of magnetic steel slots 30 include a first magnetic steel slot 31, and the number of the first magnetic steel slots 31 is multiple. The plurality of first magnetic steel slots 31 are arranged at intervals along the radial direction of the rotor punching 20. Each first magnetic steel slot 31 can be symmetrical about the straight axis. It can be understood that the plurality of first magnetic steel slots 31 are arranged at intervals along the radial direction of the rotor punching 20 in a targeted manner to reasonably form a multi-layer magnetic barrier within the limited space of the rotor punching 20, thereby increasing the magnetic resistance at the central symmetry axis of each magnetic pole portion 22, increasing the difference in magnetic resistance between the central symmetry axis of each magnetic pole portion 22 and the perpendicular bisector between adjacent magnetic pole portions 22, and thereby improving the magnetic resistance torque.

[0046] Furthermore, along the radial direction of the rotor sheet 20, the thickness of the first magnetic steel slot 31 closer to the shaft hole 21 in the plurality of first magnetic steel slots 31 is greater. That is, from the outer edge of the rotor sheet 20 to the shaft hole 21, the thickness of the plurality of first magnetic steel slots 31 is in an increasing form, so as to increase the volume of the first magnetic steel slot 31 when the number of magnetic barrier layers is fixed, so as to ensure that more magnetic steel 10 can be accommodated, thereby maximizing the electromagnetic torque within the limited radial space of the rotor sheet 20. In addition, since the heavier part of the plurality of first magnetic steel slots 31 after filling with magnetic steel 10 is close to the shaft hole 21 of the rotor sheet 20, and the lighter part is close to the outer edge of the rotor sheet 20, it is ensured that when the rotor sheet 20 rotates, the centrifugal stress on the magnetic steel 10 in the first magnetic steel slot 31 is small, thereby preventing the rotor sheet 20 from being easily damaged.

[0047] It can be understood that the present application reasonably designs the arrangement positions of the multiple first magnetic steel slots 31 in the rotor punching 20 and optimizes the structure of the multiple first magnetic steel slots 31, thereby ensuring that the filling amount of the magnetic steel 10 can be increased in the limited space of the rotor punching 20 while having a larger magnetic resistance torque, thereby further increasing the electromagnetic torque provided by the magnetic steel 10 in the first magnetic steel slot 31, and then improving the output torque.

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

[0049] It should be noted that the number of magnetic pole portions 22 in the above embodiment is only used as an exemplary introduction, that is, the number of magnetic pole portions is not limited to 8, and only needs to satisfy an even number, and the present application does not make any special restrictions on this. For example, the number of magnetic pole portions 22 can be 6, 4, etc., and the number of pole pairs of the motor corresponds to 3 and 2 respectively.

[0050] In one 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 slot 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. A second magnetic steel slot 32 is respectively arranged on both sides of each first magnetic steel slot 31, and the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 are symmetrical about the straight axis, and the extension lines of the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 are relatively close to the shaft hole 21. That is, the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 are arranged in a V shape.

[0051] It can be understood that in this embodiment, a second magnetic steel slot 32 is respectively arranged on both sides of each first magnetic steel slot 31, and each two second magnetic steel slots 32 form a magnetic barrier together with a first magnetic steel slot 31 to improve the magnetic resistance torque of the motor. At the same time, the magnetic steel 10 can be filled in the second magnetic steel slot 32 to improve the electromagnetic torque of the motor. Furthermore, the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 are arranged in a V-shape, which can improve the magnetic concentration effect and help improve the performance of the motor.

[0052] Please see Figure 4 , Figure 4 It is a schematic structural diagram of one of the magnetic pole portions 22 of the rotor punching 20 provided in the second embodiment of the present application.

[0053] like Figure 4 As shown, in one embodiment, among the multiple second magnetic steel slots 32 located on the same side of the multiple 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 fact that the thickness of the first magnetic steel slot 31 closer to the shaft hole 21 is greater among the multiple first magnetic steel slots 31, this embodiment sets the thickness of the second magnetic steel slot 32 closer to the shaft hole 21 to be greater, which can not only ensure the uniformity of the magnetic barrier, but also further increase the space that the second magnetic steel slot 32 can fill with the magnetic steel 10 when the number of magnetic barrier layers is fixed, so that the number of magnetic steels 10 filled in each magnetic pole portion 22 is larger, thereby improving the electromagnetic torque of the motor. In addition, the centrifugal stress on the magnetic steel 10 filled in the second magnetic steel slot 32 can be reduced, thereby ensuring 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 punching 20, that is, the second magnetic steel slot 32 is parallel to the radial direction of the rotor punching 20. It can be understood that setting the second magnetic steel slot 32 parallel to the radial direction of the rotor punching 20 can ensure that when the rotor 100 rotates, the various parts of the rotor punching 20 are evenly stressed, ensuring the structural stability of the rotor punching 20, while improving the space utilization of the rotor punching 20. In other embodiments, the second magnetic steel slot 32 can be set not to be parallel to the radial direction of the rotor punching 20. For details, please refer to Figure 5 , Figure 5 It is a schematic structural diagram of one of the magnetic pole portions 22 of the rotor punching 20 provided in the third embodiment of the present application.

[0055] like Figure 5 As shown, in one embodiment, the second magnetic steel slot 32 is also strip-shaped, and there is an angle between the second magnetic steel slot 32 and the radial direction of the rotor punching 20. Specifically, along the direction of the shaft hole 21 toward the outer edge of the rotor punching 20, the second magnetic steel slot 32 extends obliquely from close to the straight axis toward the direction away from the straight axis. 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 and high space utilization of the rotor punching 20 can also be guaranteed. In addition, the magnetic concentration effect can be improved, which is beneficial to improving the performance of the motor.

[0056] In one embodiment, in each layer of magnetic barriers, the 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 number of motor pole pairs. Figure 1 In the embodiment shown, the number of pole pairs p of the motor is 4, and the size of the angle α is in the range of π / 4<α<π / 2. It can be understood that the size of the angle α between the two second magnetic steel slots 32 on both sides of each first magnetic steel slot 31 is set between π / p<α<2π / p, which can avoid the angle α being too small, the width of the second magnetic steel slot 32 being small, and the torque power being low; on the other hand, it can avoid the angle α being too large, the utilization rate of the magnetic steel 10 filled in the second magnetic steel slot 32 being low, thereby affecting the electromagnetic torque and the reluctance torque.

[0057] In one embodiment, the magnetic steel slot 30 of each magnetic pole portion 22 includes a third magnetic steel slot 33, the number of the third magnetic steel slot 33 is one, and the third magnetic steel slot 33 is located on the side of the plurality of first magnetic steel slots 31 away from the shaft hole 21 along the radial direction of the rotor punching 20. It can be understood that the third magnetic steel slot 33 is provided on the side of the plurality of first magnetic steel slots 31 away from the shaft hole 21 to further utilize the remaining space of the rotor punching 20, increase the capacity of the magnetic steel 10 that can be filled in the rotor punching 20, and thus further increase the electromagnetic torque.

[0058] exist Figure 3In the embodiment shown, the third magnetic steel slot 33 is strip-shaped and is arranged parallel to the first magnetic steel slot 31, that is, the length direction of the third magnetic steel slot 33 is perpendicular to the radial direction of the rotor punching 20. Figure 5 and Figure 6 ( Figure 6 In the embodiment shown in the structural schematic diagram of one of the magnetic pole portions 22 of the rotor punching 20 provided in the fourth embodiment of the present application, the third magnetic steel slot 33 includes two first sub-magnetic steel slots 331, and the two first sub-magnetic steel slots 331 are arranged in a V shape and are symmetrical about the straight axis. The angle between the two first sub-magnetic steel slots 331 is β, where 2π / p<β<π, and p is the number of motor pole pairs. It can be understood that the size range of the angle β between the two first sub-magnetic steel slots 331 is set to: 2π / p<β<π. On the one hand, it can avoid the angle β being too small, the width of the first sub-magnetic steel slot 331 is small, and the torque power is low; on the other hand, it can avoid the angle β being too large, and the utilization rate of the magnetic steel 10 filled in the first sub-magnetic steel slot 331 is low, thereby affecting the electromagnetic torque and reluctance torque.

[0059] In another embodiment, please refer to Figure 7 In the schematic diagram of the structure of one of the magnetic pole portions 22 of the rotor punching 20 provided in the fifth embodiment of the present application, the third magnetic steel slot 33 can be arc-shaped, and the arc of the third magnetic steel slot 33 is β, wherein 2π / p<β<π, and p is the number of motor pole pairs. Similarly, setting the arc β of the third magnetic steel slot 33 within the range of 2π / p<β<π can, on the one hand, avoid the angle β being too small, the width of the third magnetic steel slot 33 being small, and the torque power being low; on the other hand, it can avoid the angle β being too large, and the utilization rate of the magnetic steel 10 filled in the third magnetic steel slot 33 being low, thereby affecting the electromagnetic torque and the reluctance torque.

[0060] Please look back Figure 3 In one embodiment, the magnetic steel slot 30 of each magnetic pole portion 22 further includes a fourth magnetic steel slot 34, and the number of the fourth magnetic steel slot 34 is one. The fourth magnetic steel slot 34 is located between the third magnetic steel slot 33 and the plurality of first magnetic steel slots 31, and the fourth magnetic steel slot 34 can be arranged in a U-shape. It can be understood that by using the space between the third magnetic steel slot 33 and the first magnetic steel slot 31 to arrange the fourth magnetic steel slot 34, the number of magnetic barrier layers of the rotor punching 20 can be increased, and the space that can be filled with the magnetic steel 10 can also be increased, thereby further improving the magnetic resistance torque and electromagnetic torque. Furthermore, by setting the fourth magnetic steel slot 34 in a U-shape, the integrity of the magnetic barrier formed by the fourth magnetic steel slot 34 can be ensured.

[0061] And in Figure 5 and Figure 7In the embodiment shown, there are two fourth magnetic steel slots 34, and both fourth magnetic steel slots 34 are located between the third magnetic steel slot 33 and the first magnetic steel slot 31, and the two fourth magnetic steel slots 34 are arranged in a V shape. In this case, the number of magnetic barrier layers can be increased, the space that can be filled with magnetic steel 10 can be increased, and the magnetic concentration effect can also be improved.

[0062] See also Figure 3 In one embodiment, at the end surface of the rotor sheet 20, the rotor sheet 20 includes a direct axis and a quadrature axis. The direct axis is the central symmetry axis of the plurality of first magnetic steel slots 31, i.e., the d-axis; the quadrature axis is the perpendicular bisector between two adjacent magnetic poles 22, i.e., the q-axis. The intersection point of the direct axis and the outer edge of the rotor sheet 20 is M, the intersection point of the perpendicular line passing through point M on the quadrature axis and the quadrature axis is N, and the length of the perpendicular line is L. MN , the thickness H of the second magnetic steel slot 32 with the smallest thickness among the plurality of second magnetic steel slots 32 min >L MN / (2n+1), where n is half the number of the second magnetic steel slots 32 in each magnetic pole portion 22 .

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

[0064] Preferably, in one embodiment, from the direction of the shaft hole 21 toward the outer edge of the rotor punching 20, the thickness of each of the plurality of first magnetic steel slots 31 is H1, H2, H3..., and H1:H2:H3:...=2H min :5 / 3H min :4 / 3H min : .... It can be understood that the thickness relationship between the first magnetic steel slots 31 in the plurality of first magnetic steel slots 31 satisfies: H1: H2: H3: ... = 2H min :5 / 3H min :4 / 3H min : ..., it can not only increase the filling amount of the magnetic steel 10 in the rotor punching 20 to improve the electromagnetic torque, but also ensure that the centrifugal stress on the area of ​​the rotor punching 20 that is relatively far away from the shaft hole 21 is small, so as to improve the strength of the rotor punching 20.

[0065] In one embodiment, a reinforcing rib 40 is provided between each first magnetic steel slot 31 and each second magnetic steel slot 32 . The reinforcing rib 40 can be used to increase the strength of the rotor punching 20 and ensure the service life of the rotor punching 20 .

[0066] Specifically, the minimum width of the reinforcing rib 40 gradually increases from the outer edge of the rotor sheet 20 close to the shaft hole 21. This design can ensure that the rotor sheet 20 can be provided with more first magnetic steel slots 31 and second magnetic steel slots 32, and can also avoid stress concentration in the area of ​​the rotor sheet 20 close to the shaft hole 21, which may cause the rotor sheet 20 to crack and break.

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

[0068] Please see Figure 6 In one embodiment, some of the first magnetic steel slots 31 include two second sub-magnetic steel slots 311. Specifically, the first magnetic steel slot 31 relatively close to the shaft hole 21 among the plurality of first magnetic steel slots 31 includes two second sub-magnetic steel slots 311. The two second sub-magnetic steel slots 311 are arranged in a V shape, and the angle between the two second sub-magnetic steel slots 311 is γ, where 2π / p<γ<π, and p is the number of motor pole pairs.

[0069] It can be understood that the provision of part of the first magnetic steel slot 31 includes two second sub-magnetic steel slots 311 arranged in a V-shape is conducive to simplifying the manufacturing process of the rotor punching 20 and improving the magnetic field gathering effect of the first magnetic steel slot 31. In addition, the size range of the angle γ of the two second sub-magnetic steel slots 311 is set between 2π / p<γ<π, which can avoid the angle γ being too small, the width of the second sub-magnetic steel slot 311 being small, and the torque power being low; on the other hand, it can avoid the angle γ being too large, and 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] exist Figure 6 In the illustrated embodiment, the rotor punching 20 is provided with a weight-reducing hole 50 penetrating along its own axial direction, and 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 punching 20. It can be understood that the design of the weight-reducing hole 50 can not only reduce the weight of the rotor punching 20, but also can serve as an oil leakage hole to guide the lubricating oil to infiltrate the rotor 100, so as to improve 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 punching 20 can be reduced in a targeted manner, thereby reducing the negative impact of centrifugal stress.

[0071] It should be noted that the positions of the weight-reducing holes 50 in the above embodiment are only used as an example. Figure 5 and Figure 7In the illustrated embodiment, the lightening hole 50 may be located between the third magnetic steel slot 33 and the fourth magnetic steel slot 34 along the radial direction of the rotor punching 20 , and may also have the same beneficial effects as described above.

[0072] In one embodiment, the magnetic steels 10 filled in each magnetic steel slot 30 are all ferrite magnetic steels. Through the above-mentioned optimized design of the magnetic steel slot 30, and based on the low cost of ferrite magnetic steel, the present application adopts ferrite magnetic steel filling, which can not only achieve the same output torque as the prior art, but also greatly reduce the cost compared with the solution of mixed filling of rare earth magnetic steel and ferrite magnetic steel in the prior art.

[0073] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A rotor punching, characterized in that: It includes an axial hole and a plurality of magnetic pole portions, wherein the axial hole is located at the center of the rotor punching, and the plurality of magnetic pole portions are arranged at intervals along the circumference of the axial hole. Each of the magnetic pole portions includes a plurality of first magnetic steel grooves for accommodating magnetic steels, and the plurality of first magnetic steel grooves are arranged at intervals along the radial direction of the rotor punching, and along the radial direction of the rotor punching, the closer the plurality of first magnetic steel grooves are to the axial hole, the greater the thickness of the first magnetic steel grooves.

2. The rotor punching according to claim 1, characterized in that: The magnetic pole portion includes a plurality of second magnetic steel grooves for accommodating magnetic steels, and the plurality of second magnetic steel grooves are arranged on both sides of the plurality of first magnetic steel grooves. A second magnetic steel groove is arranged on both sides of each of the first magnetic steel grooves, and the extension lines of the two second magnetic steel grooves on both sides of each of the first magnetic steel grooves are relatively close to the end of the shaft hole and intersect.

3. The rotor punching according to claim 2, characterized in that: The angle between the two second magnetic steel slots on both sides of each first magnetic steel slot is α, and π / p<α<2π / p, where p is the number of motor pole pairs.

4. The rotor punching according to claim 2, characterized in that: Among the plurality of second magnetic steel slots located on the same side of the plurality of first magnetic steel slots, the thickness of the second magnetic steel slot closer to the shaft hole is greater.

5. The rotor punching according to claim 2, characterized in that: The magnetic pole portion includes a third magnetic steel groove for accommodating a magnetic steel, and the third magnetic steel groove is located on a side of the plurality of first magnetic steel grooves away from the shaft hole along the radial direction of the rotor punching sheet.

6. The rotor punching according to claim 5, characterized in that: The third magnetic steel slot is in a strip shape, and the third magnetic steel slot is arranged parallel to the first magnetic steel slot; or, The third magnetic steel slot includes two first sub-magnetic steel slots, the two first sub-magnetic steel slots are arranged in a V shape, and the angle between the two first sub-magnetic steel slots is β, wherein 2π / p<β<π, p is the number of motor pole pairs; or, The third magnetic steel slot is arc-shaped, and the arc of the third magnetic steel slot is β, wherein 2π / p<β<π, and p is the number of motor pole pairs.

7. The rotor punching according to claim 5, characterized in that: The magnetic pole portion includes a fourth magnetic steel slot for accommodating a magnetic steel, 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 U-shaped; or, The number of the fourth magnetic steel slots is two, and the two fourth magnetic steel slots are arranged in a V shape.

8. The rotor punching according to claim 2, characterized in that: On the end surface of the rotor punching, the rotor punching includes a direct axis and a quadrature axis, the direct axis is the central symmetry axis of the plurality of first magnetic steel slots, the quadrature axis is the perpendicular bisector between two adjacent magnetic poles, the intersection point of the direct axis and the outer edge of the rotor punching is M, and the length of the perpendicular line of the quadrature axis passing through point M is L MN , the thickness H of the second magnetic steel slot with the smallest thickness among the plurality of second magnetic steel slots min >L MN / (2n+1), wherein n is half of the number of the second magnetic steel slots in each of the magnetic pole portions.

9. The rotor punching according to claim 8, characterized in that: From the shaft hole toward the outer edge of the rotor punching sheet, the thickness of each of the plurality of first magnetic steel slots is H1, H2, H3..., and H1:H2:H3:...=2H min :5 / 3H min :4 / 3H min :….

10. The rotor punching according to any one of claims 2 to 9, characterized in that: A reinforcing rib is provided between each of the first magnetic steel slots and each of the second magnetic steel slots, and the reinforcing rib is used to improve the strength of the rotor punching sheet.

11. The rotor punching according to claim 10, characterized in that: The minimum width of the reinforcing rib increases gradually from the outer edge of the rotor punching sheet to the axial hole.

12. The rotor punching according to claim 11, characterized in that: From the shaft hole toward the outer edge of the rotor punching sheet, the minimum width of each of the plurality of reinforcing ribs is W1, W2, W3, ..., and 4 / 3<W1 / W2<2, 11 / 10<W2 / W3<6 / 5.

13. The rotor punching according to any one of claims 1 to 9, characterized in that: Part of the first magnetic steel slots includes two second sub-magnetic steel slots, the two second sub-magnetic steel slots are arranged in a V shape, and the angle between the two second sub-magnetic steel slots is γ, where 2π / p<γ<π, and p is the number of motor pole pairs.

14. The rotor punching according to any one of claims 1 to 9, characterized in that: The rotor punching sheet is provided with a weight-reducing hole penetrating along its own axial direction, and the weight-reducing hole is located on the side of the plurality of first magnetic steel slots away from the shaft hole.

15. A rotor, characterized in that: It comprises a plurality of the magnetic steels and a rotor punching sheet as described in any one of claims 1-14.

16. A motor, characterized in that: The invention comprises a stator and a rotor punching sheet according to any one of claims 1 to 14, or comprises a rotor according to claim 15, wherein the stator surrounds the periphery of the rotor punching sheet.

17. A vehicle, characterized in that: The vehicle comprises a vehicle body and the motor as claimed in claim 16, wherein the motor is fixed to the vehicle body.

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